.gitignore

@@ -33,4 +33,3 @@ node
 package-lock.json
 
 .mvn/.develocity
-/src/test/resources/testcontainers-local.properties

.mvn/jvm.config

@@ -8,7 +8,3 @@
 --add-exports jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED
 --add-opens jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED
 --add-opens jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED
---add-opens=java.base/java.util=ALL-UNNAMED
---add-opens=java.base/java.lang.reflect=ALL-UNNAMED
---add-opens=java.base/java.text=ALL-UNNAMED
---add-opens=java.desktop/java.awt.font=ALL-UNNAMED

README.adoc

@@ -62,7 +62,7 @@ public class MyService {
 
 === Using the RestClient
 
-Please check the https://docs.spring.io/spring-data/elasticsearch/docs/current/reference/html/#elasticsearch.clients.configuration[official documentation].
+Please check the [official documentation](https://docs.spring.io/spring-data/elasticsearch/docs/current/reference/html/#elasticsearch.clients.configuration).
 
 === Maven configuration
 

ci/pipeline.properties

@@ -1,20 +1,25 @@
 # Java versions
-java.main.tag=24.0.1_9-jdk-noble
+java.main.tag=17.0.13_11-jdk-focal
-java.next.tag=24.0.1_9-jdk-noble
+java.next.tag=23.0.1_11-jdk-noble
 
 # Docker container images - standard
 docker.java.main.image=library/eclipse-temurin:${java.main.tag}
 docker.java.next.image=library/eclipse-temurin:${java.next.tag}
 
 # Supported versions of MongoDB
-docker.mongodb.6.0.version=6.0.23
+docker.mongodb.4.4.version=4.4.25
-docker.mongodb.7.0.version=7.0.20
+docker.mongodb.5.0.version=5.0.21
-docker.mongodb.8.0.version=8.0.9
+docker.mongodb.6.0.version=6.0.10
+docker.mongodb.7.0.version=7.0.2
+docker.mongodb.8.0.version=8.0.0
 
 # Supported versions of Redis
 docker.redis.6.version=6.2.13
 docker.redis.7.version=7.2.4
 
+# Supported versions of Cassandra
+docker.cassandra.3.version=3.11.16
+
 # Docker environment settings
 docker.java.inside.basic=-v $HOME:/tmp/jenkins-home
 docker.java.inside.docker=-u root -v /var/run/docker.sock:/var/run/docker.sock -v /usr/bin/docker:/usr/bin/docker -v $HOME:/tmp/jenkins-home

pom.xml

@@ -5,12 +5,12 @@
 
 	<groupId>org.springframework.data</groupId>
 	<artifactId>spring-data-elasticsearch</artifactId>
-	<version>6.0.0-SNAPSHOT</version>
+	<version>5.5.0-M1</version>
 
 	<parent>
 		<groupId>org.springframework.data.build</groupId>
 		<artifactId>spring-data-parent</artifactId>
-		<version>4.0.0-SNAPSHOT</version>
+		<version>3.5.0-M1</version>
 	</parent>
 
 	<name>Spring Data Elasticsearch</name>
@@ -18,10 +18,10 @@
 	<url>https://github.com/spring-projects/spring-data-elasticsearch</url>
 
 	<properties>
-		<springdata.commons>4.0.0-SNAPSHOT</springdata.commons>
+		<springdata.commons>3.5.0-M1</springdata.commons>
 
 		<!-- version of the ElasticsearchClient	-->
-		<elasticsearch-java>9.0.3</elasticsearch-java>
+		<elasticsearch-java>8.17.2</elasticsearch-java>
 
 		<hoverfly>0.19.0</hoverfly>
 		<log4j>2.23.1</log4j>
@@ -132,27 +132,6 @@
 			</exclusions>
 		</dependency>
 
-		<!-- the old RestCLient is an optional dependency for user that still want to use it-->
-		<dependency>
-			<groupId>org.elasticsearch.client</groupId>
-			<artifactId>elasticsearch-rest-client</artifactId>
-			<version>${elasticsearch-java}</version>
-			<exclusions>
-				<exclusion>
-					<groupId>commons-logging</groupId>
-					<artifactId>commons-logging</artifactId>
-				</exclusion>
-			</exclusions>
-			<optional>true</optional>
-		</dependency>
-
-		<dependency>
-			<groupId>com.querydsl</groupId>
-			<artifactId>querydsl-core</artifactId>
-			<version>${querydsl}</version>
-			<optional>true</optional>
-		</dependency>
-
 		<!-- Jackson JSON Mapper -->
 		<dependency>
 			<groupId>com.fasterxml.jackson.core</groupId>
@@ -471,16 +450,6 @@
 	</profiles>
 
 	<repositories>
-		<repository>
-			<id>spring-snapshot</id>
-			<url>https://repo.spring.io/snapshot</url>
-			<snapshots>
-				<enabled>true</enabled>
-			</snapshots>
-			<releases>
-				<enabled>false</enabled>
-			</releases>
-		</repository>
 		<repository>
 			<id>spring-milestone</id>
 			<url>https://repo.spring.io/milestone</url>

src/main/antora/modules/ROOT/nav.adoc

@@ -12,7 +12,6 @@
 *** xref:migration-guides/migration-guide-5.2-5.3.adoc[]
 *** xref:migration-guides/migration-guide-5.3-5.4.adoc[]
 *** xref:migration-guides/migration-guide-5.4-5.5.adoc[]
-*** xref:migration-guides/migration-guide-5.5-6.0.adoc[]
 
 
 * xref:elasticsearch.adoc[]

src/main/antora/modules/ROOT/pages/elasticsearch/auditing.adoc

@@ -10,7 +10,7 @@ In order for the auditing code to be able to decide whether an entity instance i
 ----
 package org.springframework.data.domain;
 
-import org.jspecify.annotations.Nullable;
+import org.springframework.lang.Nullable;
 
 public interface Persistable<ID> {
     @Nullable

src/main/antora/modules/ROOT/pages/elasticsearch/clients.adoc

@@ -6,10 +6,10 @@ This chapter illustrates configuration and usage of supported Elasticsearch clie
 Spring Data Elasticsearch operates upon an Elasticsearch client (provided by Elasticsearch client libraries) that is connected to a single Elasticsearch node or a cluster.
 Although the Elasticsearch Client can be used directly to work with the cluster, applications using Spring Data Elasticsearch normally use the higher level abstractions of xref:elasticsearch/template.adoc[Elasticsearch Operations] and xref:elasticsearch/repositories/elasticsearch-repositories.adoc[Elasticsearch Repositories].
 
-[[elasticsearch.clients.rest5client]]
+[[elasticsearch.clients.restclient]]
-== Imperative Rest5Client
+== Imperative Rest Client
 
-To use the imperative (non-reactive) Rest5Client, a configuration bean must be configured like this:
+To use the imperative (non-reactive) client, a configuration bean must be configured like this:
 
 ====
 [source,java]
@@ -31,81 +31,7 @@ public class MyClientConfig extends ElasticsearchConfiguration {
 <.> for a detailed description of the builder methods see xref:elasticsearch/clients.adoc#elasticsearch.clients.configuration[Client Configuration]
 ====
 
-The javadoc:org.springframework.data.elasticsearch.client.elc.ElasticsearchConfiguration[] class allows further configuration by overriding for example the `jsonpMapper()` or `transportOptions()` methods.
+The javadoc:org.springframework.data.elasticsearch.client.elc.ElasticsearchConfiguration[]] class allows further configuration by overriding for example the `jsonpMapper()` or `transportOptions()` methods.
-
-
-The following beans can then be injected in other Spring components:
-
-====
-[source,java]
-----
-import org.springframework.beans.factory.annotation.Autowired;@Autowired
-ElasticsearchOperations operations;      <.>
-
-@Autowired
-ElasticsearchClient elasticsearchClient; <.>
-
-@Autowired
-Rest5Client rest5Client;                 <.>
-
-@Autowired
-JsonpMapper jsonpMapper;                 <.>
-----
-
-<.> an implementation of javadoc:org.springframework.data.elasticsearch.core.ElasticsearchOperations[]
-<.> the `co.elastic.clients.elasticsearch.ElasticsearchClient` that is used.
-<.> the low level `Rest5Client` from the Elasticsearch libraries
-<.> the `JsonpMapper` user by the Elasticsearch `Transport`
-====
-
-Basically one should just use the javadoc:org.springframework.data.elasticsearch.core.ElasticsearchOperations[] to interact with the Elasticsearch cluster.
-When using repositories, this instance is used under the hood as well.
-
-[[elasticsearch.clients.restclient]]
-== Deprecated Imperative RestClient
-
-To use the imperative (non-reactive) RestClient - deprecated since version 6 - , the following dependency needs to be added, adapt the correct version. The exclusion is needed in a Spring Boot application:
-====
-[source,xml]
-----
-        <dependency>
-            <groupId>org.elasticsearch.client</groupId>
-            <artifactId>elasticsearch-rest-client</artifactId>
-            <version>${elasticsearch-client.version}</version>
-            <exclusions>
-                <exclusion>
-                    <groupId>commons-logging</groupId>
-                    <artifactId>commons-logging</artifactId>
-                </exclusion>
-            </exclusions>
-        </dependency>
-
-----
-====
-
-The configuration bean must be configured like this:
-
-====
-[source,java]
-----
-import org.springframework.data.elasticsearch.client.elc.ElasticsearchLegacyRestClientConfiguration;
-
-@Configuration
-public class MyClientConfig extends ElasticsearchLegacyRestClientConfiguration {
-
-	@Override
-	public ClientConfiguration clientConfiguration() {
-		return ClientConfiguration.builder()           <.>
-			.connectedTo("localhost:9200")
-			.build();
-	}
-}
-----
-
-<.> for a detailed description of the builder methods see xref:elasticsearch/clients.adoc#elasticsearch.clients.configuration[Client Configuration]
-====
-
-The javadoc:org.springframework.data.elasticsearch.client.elc.ElasticsearchConfiguration[] class allows further configuration by overriding for example the `jsonpMapper()` or `transportOptions()` methods.
 
 
 The following beans can then be injected in other Spring components:
@@ -135,8 +61,8 @@ JsonpMapper jsonpMapper;                 <.>
 Basically one should just use the javadoc:org.springframework.data.elasticsearch.core.ElasticsearchOperations[] to interact with the Elasticsearch cluster.
 When using repositories, this instance is used under the hood as well.
 
-[[elasticsearch.clients.reactiverest5client]]
+[[elasticsearch.clients.reactiverestclient]]
-== Reactive Rest5Client
+== Reactive Rest Client
 
 When working with the reactive stack, the configuration must be derived from a different class:
 
@@ -173,65 +99,6 @@ ReactiveElasticsearchOperations operations;      <.>
 @Autowired
 ReactiveElasticsearchClient elasticsearchClient; <.>
 
-@Autowired
-Rest5Client rest5Client;                           <.>
-
-@Autowired
-JsonpMapper jsonpMapper;                         <.>
-----
-
-the following can be injected:
-
-<.> an implementation of javadoc:org.springframework.data.elasticsearch.core.ReactiveElasticsearchOperations[]
-<.> the `org.springframework.data.elasticsearch.client.elc.ReactiveElasticsearchClient` that is used.
-This is a reactive implementation based on the Elasticsearch client implementation.
-<.> the low level `RestClient` from the Elasticsearch libraries
-<.> the `JsonpMapper` user by the Elasticsearch `Transport`
-====
-
-Basically one should just use the javadoc:org.springframework.data.elasticsearch.core.ReactiveElasticsearchOperations[] to interact with the Elasticsearch cluster.
-When using repositories, this instance is used under the hood as well.
-
-[[elasticsearch.clients.reactiverestclient]]
-== Deprecated Reactive RestClient
-
-See the section above for the imperative code to use the deprecated RestClient for the necessary dependencies to include.
-
-When working with the reactive stack, the configuration must be derived from a different class:
-
-====
-[source,java]
-----
-import org.springframework.data.elasticsearch.client.elc.ReactiveElasticsearchLegacyRestClientConfiguration;
-
-@Configuration
-public class MyClientConfig extends ReactiveElasticsearchLegacyRestClientConfiguration {
-
-	@Override
-	public ClientConfiguration clientConfiguration() {
-		return ClientConfiguration.builder()           <.>
-			.connectedTo("localhost:9200")
-			.build();
-	}
-}
-----
-
-<.> for a detailed description of the builder methods see xref:elasticsearch/clients.adoc#elasticsearch.clients.configuration[Client Configuration]
-====
-
-The javadoc:org.springframework.data.elasticsearch.client.elc.ReactiveElasticsearchConfiguration[] class allows further configuration by overriding for example the `jsonpMapper()` or `transportOptions()` methods.
-
-The following beans can then be injected in other Spring components:
-
-====
-[source,java]
-----
-@Autowired
-ReactiveElasticsearchOperations operations;      <.>
-
-@Autowired
-ReactiveElasticsearchClient elasticsearchClient; <.>
-
 @Autowired
 RestClient restClient;                           <.>
 
@@ -316,25 +183,8 @@ In the case this is not enough, the user can add callback functions by using the
 
 The following callbacks are provided:
 
-[[elasticsearch.clients.configuration.callbacks.rest5]]
-==== Configuration of the low level Elasticsearch `Rest5Client`:
-
-This callback provides a `org.elasticsearch.client.RestClientBuilder` that can be used to configure the Elasticsearch
-`RestClient`:
-====
-[source,java]
-----
-ClientConfiguration.builder()
-    .connectedTo("localhost:9200", "localhost:9291")
-    .withClientConfigurer(Rest5Clients.ElasticsearchRest5ClientConfigurationCallback.from(restClientBuilder -> {
-        // configure the Elasticsearch Rest5Client
-        return restClientBuilder;
-    }))
-    .build();
-----
-====
 [[elasticsearch.clients.configuration.callbacks.rest]]
-==== Configuration of the deprecated low level Elasticsearch `RestClient`:
+==== Configuration of the low level Elasticsearch `RestClient`:
 
 This callback provides a `org.elasticsearch.client.RestClientBuilder` that can be used to configure the Elasticsearch
 `RestClient`:
@@ -343,7 +193,7 @@ This callback provides a `org.elasticsearch.client.RestClientBuilder` that can b
 ----
 ClientConfiguration.builder()
     .connectedTo("localhost:9200", "localhost:9291")
-    .withClientConfigurer(RestClients.ElasticsearchRestClientConfigurationCallback.from(restClientBuilder -> {
+    .withClientConfigurer(ElasticsearchClients.ElasticsearchRestClientConfigurationCallback.from(restClientBuilder -> {
         // configure the Elasticsearch RestClient
         return restClientBuilder;
     }))
@@ -351,29 +201,10 @@ ClientConfiguration.builder()
 ----
 ====
 
-[[elasticsearch.clients.configurationcallbacks.httpasync5]]
-==== Configuration of the HttpAsyncClient used by the low level Elasticsearch `Rest5Client`:
-
-This callback provides a `org.apache.hc.client5.http.impl.async.HttpAsyncClientBuilder` to configure the HttpClient that is
-used by the `Rest5Client`.
-
-====
-[source,java]
-----
-ClientConfiguration.builder()
-    .connectedTo("localhost:9200", "localhost:9291")
-    .withClientConfigurer(Rest5Clients.ElasticsearchHttpClientConfigurationCallback.from(httpAsyncClientBuilder -> {
-        // configure the HttpAsyncClient
-        return httpAsyncClientBuilder;
-    }))
-    .build();
-----
-====
-
 [[elasticsearch.clients.configurationcallbacks.httpasync]]
-==== Configuration of the HttpAsyncClient used by the deprecated low level Elasticsearch `RestClient`:
+==== Configuration of the HttpAsyncClient used by the low level Elasticsearch `RestClient`:
 
-This callback provides a `org.apache.http.impl.nio.client.HttpAsyncClientBuilder` to configure the HttpClient that is
+This callback provides a `org.apache.http.impl.nio.client.HttpAsyncClientBuilder` to configure the HttpCLient that is
 used by the `RestClient`.
 
 ====
@@ -381,7 +212,7 @@ used by the `RestClient`.
 ----
 ClientConfiguration.builder()
     .connectedTo("localhost:9200", "localhost:9291")
-    .withClientConfigurer(RestClients.ElasticsearchHttpClientConfigurationCallback.from(httpAsyncClientBuilder -> {
+    .withClientConfigurer(ElasticsearchClients.ElasticsearchHttpClientConfigurationCallback.from(httpAsyncClientBuilder -> {
         // configure the HttpAsyncClient
         return httpAsyncClientBuilder;
     }))

src/main/antora/modules/ROOT/pages/elasticsearch/elasticsearch-new.adoc

@@ -1,21 +1,11 @@
 [[new-features]]
 = What's new
 
-[[new-features.6-0-0]]
-== New in Spring Data Elasticsearch 6.0
-
-* Upgarde to Spring 7
-* Switch to jspecify nullability annotations
-* Upgrade to Elasticsearch 9.0.3
-* Use the new Elasticsearch Rest5Client as default
-
-
 [[new-features.5-5-0]]
 == New in Spring Data Elasticsearch 5.5
 
-* Upgrade to Elasticsearch 8.18.1.
+* Upgrade to Elasticsearch 8.17.2.
 * Add support for the `@SearchTemplateQuery` annotation on repository methods.
-* Scripted field properties of type collection can be populated from scripts returning arrays.
 
 [[new-features.5-4-0]]
 == New in Spring Data Elasticsearch 5.4

src/main/antora/modules/ROOT/pages/elasticsearch/scripted-and-runtime-fields.adoc

@@ -20,12 +20,12 @@ Whereas the birthdate is fix, the age depends on the time when a query is issued
 ====
 [source,java]
 ----
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.annotation.Id;
 import org.springframework.data.elasticsearch.annotations.DateFormat;
 import org.springframework.data.elasticsearch.annotations.Document;
 import org.springframework.data.elasticsearch.annotations.Field;
 import org.springframework.data.elasticsearch.annotations.ScriptedField;
+import org.springframework.lang.Nullable;
 
 import java.time.LocalDate;
 import java.time.format.DateTimeFormatter;

src/main/antora/modules/ROOT/pages/elasticsearch/versions.adoc

@@ -6,11 +6,10 @@ The following table shows the Elasticsearch and Spring versions that are used by
 [cols="^,^,^,^",options="header"]
 |===
 | Spring Data Release Train | Spring Data Elasticsearch | Elasticsearch | Spring Framework
-| 2025.1 (in development) | 6.0.x | 9.0.3 | 7.0.x
+| 2025.0 (in development) | 5.5.x | 8.17.2 | 6.2.x
-| 2025.0 | 5.5.x | 8.18.1 | 6.2.x
 | 2024.1 | 5.4.x | 8.15.5 | 6.1.x
-| 2024.0 | 5.3.xfootnote:oom[Out of maintenance] | 8.13.4 | 6.1.x
+| 2024.0 | 5.3.x | 8.13.4 | 6.1.x
-| 2023.1 (Vaughan) | 5.2.xfootnote:oom[] | 8.11.1 | 6.1.x
+| 2023.1 (Vaughan) | 5.2.xfootnote:oom[Out of maintenance] | 8.11.1 | 6.1.x
 | 2023.0 (Ullmann) | 5.1.xfootnote:oom[] | 8.7.1 | 6.0.x
 | 2022.0 (Turing) | 5.0.xfootnote:oom[] | 8.5.3 | 6.0.x
 | 2021.2 (Raj) | 4.4.xfootnote:oom[] | 7.17.3 | 5.3.x

src/main/antora/modules/ROOT/pages/migration-guides/migration-guide-5.4-5.5.adoc

@@ -20,11 +20,3 @@ Some classes that probably are not used by a library user have been renamed, the
 |===
 
 === Removals
-
-The following methods that had been deprecated since release 5.3 have been removed:
-```
-DocumentOperations.delete(Query, Class<?>)
-DocumentOperations.delete(Query, Class<?>, IndexCoordinates)
-ReactiveDocumentOperations.delete(Query, Class<?>)
-ReactiveDocumentOperations.delete(Query, Class<?>, IndexCoordinates)
-```

src/main/antora/modules/ROOT/pages/migration-guides/migration-guide-5.5-6.0.adoc

@@ -1,25 +0,0 @@
-[[elasticsearch-migration-guide-5.5-6.0]]
-= Upgrading from 5.5.x to 6.0.x
-
-This section describes breaking changes from version 5.5.x to 6.0.x and how removed features can be replaced by new introduced features.
-
-[[elasticsearch-migration-guide-5.5-6.0.breaking-changes]]
-== Breaking Changes
-
-From version 6.0 on, Spring Data Elasticsearch uses the Elasticsearch 9 libraries and as default the new `Rest5Client` provided by these libraries. It is still possible to use the old `RestClient`, check xref:elasticsearch/clients.adoc[Elasticsearch clients] for information. The configuration callbacks for this `RestClient` have been moved from `org.springframework.data.elasticsearch.client.elc.ElasticsearchClients` to the `org.springframework.data.elasticsearch.client.elc.rest_client.RestClients` class.
-
-[[elasticsearch-migration-guide-5.5-6.0.deprecations]]
-== Deprecations
-
-All the code using the old `RestClient` has been moved to the `org.springframework.data.elasticsearch.client.elc.rest_client` package and has been deprecated. Users should switch to the classes from the `org.springframework.data.elasticsearch.client.elc.rest5_client` package.
-
-
-=== Removals
-
-The `org.springframework.data.elasticsearch.core.query.ScriptType` enum has been removed. To distinguish between an inline and a stored script set the appropriate values in the `org.springframework.data.elasticsearch.core.query.ScriptData` record.
-
-These methods have been removed because the Elasticsearch Client 9 does not support them anymore:
-```
-org.springframework.data.elasticsearch.client.elc.ReactiveElasticsearchIndicesClient.unfreeze(UnfreezeRequest)
-org.springframework.data.elasticsearch.client.elc.ReactiveElasticsearchIndicesClient.unfreeze(Function<UnfreezeRequest.Builder, ObjectBuilder<UnfreezeRequest>>)
-```

src/main/java/org/springframework/data/elasticsearch/ElasticsearchErrorCause.java

@@ -15,9 +15,9 @@
  */
 package org.springframework.data.elasticsearch;
 
-import java.util.List;
+import org.springframework.lang.Nullable;
 
-import org.jspecify.annotations.Nullable;
+import java.util.List;
 
 /**
  * Object describing an Elasticsearch error
@@ -26,7 +26,8 @@ import org.jspecify.annotations.Nullable;
  * @since 4.4
  */
 public class ElasticsearchErrorCause {
-	@Nullable private final String type;
+	@Nullable
+	private final String type;
 
 	private final String reason;
 

src/main/java/org/springframework/data/elasticsearch/UncategorizedElasticsearchException.java

@@ -15,8 +15,8 @@
  */
 package org.springframework.data.elasticsearch;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.dao.UncategorizedDataAccessException;
+import org.springframework.lang.Nullable;
 
 /**
  * @author Peter-Josef Meisch

src/main/java/org/springframework/data/elasticsearch/annotations/package-info.java

@@ -1,2 +1,3 @@
-@org.jspecify.annotations.NullMarked
+@org.springframework.lang.NonNullApi
+@org.springframework.lang.NonNullFields
 package org.springframework.data.elasticsearch.annotations;

src/main/java/org/springframework/data/elasticsearch/aot/SpringDataElasticsearchRuntimeHints.java

@@ -19,7 +19,6 @@ import static org.springframework.data.elasticsearch.aot.ElasticsearchAotPredica
 
 import java.util.Arrays;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.aot.hint.MemberCategory;
 import org.springframework.aot.hint.RuntimeHints;
 import org.springframework.aot.hint.RuntimeHintsRegistrar;
@@ -33,6 +32,7 @@ import org.springframework.data.elasticsearch.core.event.ReactiveAfterConvertCal
 import org.springframework.data.elasticsearch.core.event.ReactiveAfterLoadCallback;
 import org.springframework.data.elasticsearch.core.event.ReactiveAfterSaveCallback;
 import org.springframework.data.elasticsearch.core.event.ReactiveBeforeConvertCallback;
+import org.springframework.lang.Nullable;
 
 /**
  * @author Peter-Josef Meisch

src/main/java/org/springframework/data/elasticsearch/aot/package-info.java

@@ -1,2 +1,3 @@
-@org.jspecify.annotations.NullMarked
+@org.springframework.lang.NonNullApi
+@org.springframework.lang.NonNullFields
 package org.springframework.data.elasticsearch.aot;

src/main/java/org/springframework/data/elasticsearch/client/ClientConfiguration.java

@@ -25,8 +25,8 @@ import java.util.function.Supplier;
 import javax.net.ssl.HostnameVerifier;
 import javax.net.ssl.SSLContext;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.support.HttpHeaders;
+import org.springframework.lang.Nullable;
 
 /**
  * Configuration interface exposing common client configuration properties for Elasticsearch clients.
@@ -127,16 +127,10 @@ public interface ClientConfiguration {
 	Optional<String> getCaFingerprint();
 
 	/**
-	 * Returns the {@link HostnameVerifier} to use. Must be {@link Optional#empty()} if not configured.
+	 * Returns the {@link HostnameVerifier} to use. Can be {@link Optional#empty()} if not configured.
-	 * Cannot be used with the Rest5Client used from Elasticsearch 9 on as the underlying Apache http components 5 does not offer a way
-	 * to set this. Users that need a hostname verifier must integrate this in a SSLContext.
-	 * Returning a value here is ignored in this case
 	 *
 	 * @return the {@link HostnameVerifier} to use. Can be {@link Optional#empty()} if not configured.
-	 * @deprecated since 6.0
 	 */
-	// todo #3117 document this
-	@Deprecated(since = "6.0", forRemoval=true)
 	Optional<HostnameVerifier> getHostNameVerifier();
 
 	/**

src/main/java/org/springframework/data/elasticsearch/client/ClientConfigurationBuilder.java

@@ -25,11 +25,11 @@ import java.util.function.Supplier;
 import javax.net.ssl.HostnameVerifier;
 import javax.net.ssl.SSLContext;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.client.ClientConfiguration.ClientConfigurationBuilderWithRequiredEndpoint;
 import org.springframework.data.elasticsearch.client.ClientConfiguration.MaybeSecureClientConfigurationBuilder;
 import org.springframework.data.elasticsearch.client.ClientConfiguration.TerminalClientConfigurationBuilder;
 import org.springframework.data.elasticsearch.support.HttpHeaders;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**

src/main/java/org/springframework/data/elasticsearch/client/DefaultClientConfiguration.java

@@ -24,8 +24,9 @@ import java.util.function.Supplier;
 import javax.net.ssl.HostnameVerifier;
 import javax.net.ssl.SSLContext;
 
-import org.jspecify.annotations.Nullable;
+import org.elasticsearch.client.RestClientBuilder.HttpClientConfigCallback;
 import org.springframework.data.elasticsearch.support.HttpHeaders;
+import org.springframework.lang.Nullable;
 
 /**
  * Default {@link ClientConfiguration} implementation.

src/main/java/org/springframework/data/elasticsearch/client/elc/AbstractQueryProcessor.java

@@ -17,10 +17,10 @@ package org.springframework.data.elasticsearch.client.elc;
 
 import java.util.function.Consumer;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.query.CriteriaQuery;
 import org.springframework.data.elasticsearch.core.query.Query;
 import org.springframework.data.elasticsearch.core.query.StringQuery;
+import org.springframework.lang.Nullable;
 
 /**
  * An abstract class that serves as a base for query processors. It provides a common interface and basic functionality
@@ -38,8 +38,8 @@ public abstract class AbstractQueryProcessor {
 	 * @param queryConverter correct mapped field names and the values to the converted values.
 	 * @return an Elasticsearch {@literal query}.
 	 */
-
+	@Nullable
-	static co.elastic.clients.elasticsearch._types.query_dsl.@Nullable Query getEsQuery(@Nullable Query query,
+	static co.elastic.clients.elasticsearch._types.query_dsl.Query getEsQuery(@Nullable Query query,
 			@Nullable Consumer<Query> queryConverter) {
 		if (query == null) {
 			return null;

src/main/java/org/springframework/data/elasticsearch/client/elc/CriteriaQueryProcessor.java

@@ -31,13 +31,13 @@ import java.util.Iterator;
 import java.util.List;
 import java.util.Objects;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.annotations.FieldType;
 import org.springframework.data.elasticsearch.core.query.Criteria;
 import org.springframework.data.elasticsearch.core.query.Field;
 import org.springframework.data.elasticsearch.core.query.HasChildQuery;
 import org.springframework.data.elasticsearch.core.query.HasParentQuery;
 import org.springframework.data.elasticsearch.core.query.InnerHitsQuery;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**

src/main/java/org/springframework/data/elasticsearch/client/elc/DocumentAdapters.java

@@ -24,17 +24,6 @@ import co.elastic.clients.elasticsearch.core.search.Hit;
 import co.elastic.clients.elasticsearch.core.search.NestedIdentity;
 import co.elastic.clients.json.JsonData;
 import co.elastic.clients.json.JsonpMapper;
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
-import org.jspecify.annotations.Nullable;
-import org.springframework.data.elasticsearch.core.MultiGetItem;
-import org.springframework.data.elasticsearch.core.document.Document;
-import org.springframework.data.elasticsearch.core.document.Explanation;
-import org.springframework.data.elasticsearch.core.document.NestedMetaData;
-import org.springframework.data.elasticsearch.core.document.SearchDocument;
-import org.springframework.data.elasticsearch.core.document.SearchDocumentAdapter;
-import org.springframework.data.elasticsearch.core.document.SearchDocumentResponse;
-import org.springframework.util.Assert;
 
 import java.util.Collections;
 import java.util.LinkedHashMap;
@@ -43,6 +32,18 @@ import java.util.Map;
 import java.util.function.Function;
 import java.util.stream.Collectors;
 
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.springframework.data.elasticsearch.core.MultiGetItem;
+import org.springframework.data.elasticsearch.core.document.Document;
+import org.springframework.data.elasticsearch.core.document.Explanation;
+import org.springframework.data.elasticsearch.core.document.NestedMetaData;
+import org.springframework.data.elasticsearch.core.document.SearchDocument;
+import org.springframework.data.elasticsearch.core.document.SearchDocumentAdapter;
+import org.springframework.data.elasticsearch.core.document.SearchDocumentResponse;
+import org.springframework.lang.Nullable;
+import org.springframework.util.Assert;
+
 /**
  * Utility class to adapt different Elasticsearch responses to a
  * {@link org.springframework.data.elasticsearch.core.document.Document}
@@ -56,8 +57,7 @@ final class DocumentAdapters {
 
 	private static final Log LOGGER = LogFactory.getLog(DocumentAdapters.class);
 
-    private DocumentAdapters() {
+	private DocumentAdapters() {}
-    }
 
 	/**
 	 * Creates a {@link SearchDocument} from a {@link Hit} returned by the Elasticsearch client.
@@ -83,7 +83,7 @@ final class DocumentAdapters {
 
 		Explanation explanation = from(hit.explanation());
 
-        Map<String, Double> matchedQueries = hit.matchedQueries();
+		List<String> matchedQueries = hit.matchedQueries();
 
 		Function<Map<String, JsonData>, EntityAsMap> fromFields = fields -> {
 			StringBuilder sb = new StringBuilder("{");
@@ -160,7 +160,7 @@ final class DocumentAdapters {
 	}
 
 	@Nullable
-    private static Explanation from(co.elastic.clients.elasticsearch.core.explain.@Nullable Explanation explanation) {
+	private static Explanation from(@Nullable co.elastic.clients.elasticsearch.core.explain.Explanation explanation) {
 
 		if (explanation == null) {
 			return null;

src/main/java/org/springframework/data/elasticsearch/client/elc/ElasticsearchAggregations.java

@@ -22,8 +22,8 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.AggregationsContainer;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**

src/main/java/org/springframework/data/elasticsearch/client/elc/ElasticsearchClientFactoryBean.java

@@ -19,12 +19,12 @@ import co.elastic.clients.elasticsearch.ElasticsearchClient;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-import org.jspecify.annotations.Nullable;
 import org.springframework.beans.factory.DisposableBean;
 import org.springframework.beans.factory.FactoryBean;
 import org.springframework.beans.factory.FactoryBeanNotInitializedException;
 import org.springframework.beans.factory.InitializingBean;
 import org.springframework.data.elasticsearch.client.ClientConfiguration;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**

src/main/java/org/springframework/data/elasticsearch/client/elc/ElasticsearchClients.java

@@ -15,38 +15,44 @@
  */
 package org.springframework.data.elasticsearch.client.elc;
 
-import static org.springframework.data.elasticsearch.client.elc.rest5_client.Rest5Clients.*;
-import static org.springframework.data.elasticsearch.client.elc.rest_client.RestClients.*;
-
 import co.elastic.clients.elasticsearch.ElasticsearchClient;
 import co.elastic.clients.json.JsonpMapper;
 import co.elastic.clients.json.jackson.JacksonJsonpMapper;
 import co.elastic.clients.transport.ElasticsearchTransport;
 import co.elastic.clients.transport.TransportOptions;
+import co.elastic.clients.transport.TransportUtils;
 import co.elastic.clients.transport.Version;
-import co.elastic.clients.transport.rest5_client.Rest5ClientOptions;
-import co.elastic.clients.transport.rest5_client.Rest5ClientTransport;
-import co.elastic.clients.transport.rest5_client.low_level.RequestOptions;
-import co.elastic.clients.transport.rest5_client.low_level.Rest5Client;
 import co.elastic.clients.transport.rest_client.RestClientOptions;
 import co.elastic.clients.transport.rest_client.RestClientTransport;
 
+import java.net.InetSocketAddress;
+import java.time.Duration;
+import java.util.Arrays;
+import java.util.List;
 import java.util.function.Consumer;
 import java.util.function.Function;
+import java.util.function.Supplier;
+import java.util.stream.Collectors;
 
+import org.apache.http.HttpHost;
+import org.apache.http.HttpRequest;
+import org.apache.http.HttpRequestInterceptor;
+import org.apache.http.client.config.RequestConfig;
 import org.apache.http.entity.ContentType;
 import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
+import org.apache.http.message.BasicHeader;
 import org.apache.http.message.BasicNameValuePair;
+import org.apache.http.protocol.HttpContext;
+import org.elasticsearch.client.RequestOptions;
 import org.elasticsearch.client.RestClient;
-import org.jspecify.annotations.Nullable;
+import org.elasticsearch.client.RestClientBuilder;
 import org.springframework.data.elasticsearch.client.ClientConfiguration;
-import org.springframework.data.elasticsearch.support.VersionInfo;
+import org.springframework.data.elasticsearch.support.HttpHeaders;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**
- * Utility class to create the different Elasticsearch clients. The RestClient class is the one used in Elasticsearch
+ * Utility class to create the different Elasticsearch clients
- * until version 9, it is still available, but it's use is deprecated. The Rest5Client class is the one that should be
- * used from Elasticsearch 9 on.
  *
  * @author Peter-Josef Meisch
  * @since 4.4
@@ -113,32 +119,18 @@ public final class ElasticsearchClients {
 	 *
 	 * @param restClient the underlying {@link RestClient}
 	 * @return the {@link ReactiveElasticsearchClient}
-	 * @deprecated since 6.0, use the version with a Rest5Client.
 	 */
-	@Deprecated(since = "6.0", forRemoval = true)
 	public static ReactiveElasticsearchClient createReactive(RestClient restClient) {
 		return createReactive(restClient, null, DEFAULT_JSONP_MAPPER);
 	}
 
-	/**
-	 * Creates a new {@link ReactiveElasticsearchClient}.
-	 *
-	 * @param rest5Client the underlying {@link RestClient}
-	 * @return the {@link ReactiveElasticsearchClient}
-	 */
-	public static ReactiveElasticsearchClient createReactive(Rest5Client rest5Client) {
-		return createReactive(rest5Client, null, DEFAULT_JSONP_MAPPER);
-	}
-
 	/**
 	 * Creates a new {@link ReactiveElasticsearchClient}.
 	 *
 	 * @param restClient the underlying {@link RestClient}
 	 * @param transportOptions options to be added to each request.
 	 * @return the {@link ReactiveElasticsearchClient}
-	 * @deprecated since 6.0, use the version with a Rest5Client.
 	 */
-	@Deprecated(since = "6.0", forRemoval = true)
 	public static ReactiveElasticsearchClient createReactive(RestClient restClient,
 			@Nullable TransportOptions transportOptions, JsonpMapper jsonpMapper) {
 
@@ -147,21 +139,6 @@ public final class ElasticsearchClients {
 		var transport = getElasticsearchTransport(restClient, REACTIVE_CLIENT, transportOptions, jsonpMapper);
 		return createReactive(transport);
 	}
-	/**
-	 * Creates a new {@link ReactiveElasticsearchClient}.
-	 *
-	 * @param rest5Client the underlying {@link RestClient}
-	 * @param transportOptions options to be added to each request.
-	 * @return the {@link ReactiveElasticsearchClient}
-	 */
-	public static ReactiveElasticsearchClient createReactive(Rest5Client rest5Client,
-			@Nullable TransportOptions transportOptions, JsonpMapper jsonpMapper) {
-
-		Assert.notNull(rest5Client, "restClient must not be null");
-
-		var transport = getElasticsearchTransport(rest5Client, REACTIVE_CLIENT, transportOptions, jsonpMapper);
-		return createReactive(transport);
-	}
 
 	/**
 	 * Creates a new {@link ReactiveElasticsearchClient} that uses the given {@link ElasticsearchTransport}.
@@ -179,21 +156,17 @@ public final class ElasticsearchClients {
 
 	// region imperative client
 	/**
-	 * Creates a new imperative {@link ElasticsearchClient}. This uses a RestClient, if the old RestClient is needed, this
+	 * Creates a new imperative {@link ElasticsearchClient}
-	 * must be created with the {@link org.springframework.data.elasticsearch.client.elc.rest_client.RestClients} class
-	 * and passed in as parameter.
 	 *
 	 * @param clientConfiguration configuration options, must not be {@literal null}.
 	 * @return the {@link ElasticsearchClient}
 	 */
 	public static ElasticsearchClient createImperative(ClientConfiguration clientConfiguration) {
-		return createImperative(getRest5Client(clientConfiguration), null, DEFAULT_JSONP_MAPPER);
+		return createImperative(getRestClient(clientConfiguration), null, DEFAULT_JSONP_MAPPER);
 	}
 
 	/**
-	 * Creates a new imperative {@link ElasticsearchClient}. This uses a RestClient, if the old RestClient is needed, this
+	 * Creates a new imperative {@link ElasticsearchClient}
-	 * must be created with the {@link org.springframework.data.elasticsearch.client.elc.rest_client.RestClients} class
-	 * and passed in as parameter.
 	 *
 	 * @param clientConfiguration configuration options, must not be {@literal null}.
 	 * @param transportOptions options to be added to each request.
@@ -201,7 +174,7 @@ public final class ElasticsearchClients {
 	 */
 	public static ElasticsearchClient createImperative(ClientConfiguration clientConfiguration,
 			TransportOptions transportOptions) {
-		return createImperative(getRest5Client(clientConfiguration), transportOptions, DEFAULT_JSONP_MAPPER);
+		return createImperative(getRestClient(clientConfiguration), transportOptions, DEFAULT_JSONP_MAPPER);
 	}
 
 	/**
@@ -209,23 +182,11 @@ public final class ElasticsearchClients {
 	 *
 	 * @param restClient the RestClient to use
 	 * @return the {@link ElasticsearchClient}
-	 * @deprecated since 6.0, use the version with a Rest5Client.
 	 */
-	@Deprecated(since = "6.0", forRemoval = true)
 	public static ElasticsearchClient createImperative(RestClient restClient) {
 		return createImperative(restClient, null, DEFAULT_JSONP_MAPPER);
 	}
 
-	/**
-	 * Creates a new imperative {@link ElasticsearchClient}
-	 *
-	 * @param rest5Client the Rest5Client to use
-	 * @return the {@link ElasticsearchClient}
-	 */
-	public static ElasticsearchClient createImperative(Rest5Client rest5Client) {
-		return createImperative(rest5Client, null, DEFAULT_JSONP_MAPPER);
-	}
-
 	/**
 	 * Creates a new imperative {@link ElasticsearchClient}
 	 *
@@ -233,9 +194,7 @@ public final class ElasticsearchClients {
 	 * @param transportOptions options to be added to each request.
 	 * @param jsonpMapper the mapper for the transport to use
 	 * @return the {@link ElasticsearchClient}
-	 * @deprecated since 6.0, use the version with a Rest5Client.
 	 */
-	@Deprecated(since = "6.0", forRemoval = true)
 	public static ElasticsearchClient createImperative(RestClient restClient, @Nullable TransportOptions transportOptions,
 			JsonpMapper jsonpMapper) {
 
@@ -247,27 +206,6 @@ public final class ElasticsearchClients {
 		return createImperative(transport);
 	}
 
-	/**
-	 * Creates a new imperative {@link ElasticsearchClient}
-	 *
-	 * @param rest5Client the Rest5Client to use
-	 * @param transportOptions options to be added to each request.
-	 * @param jsonpMapper the mapper for the transport to use
-	 * @return the {@link ElasticsearchClient}
-	 * @since 6.0
-	 */
-	public static ElasticsearchClient createImperative(Rest5Client rest5Client,
-			@Nullable TransportOptions transportOptions,
-			JsonpMapper jsonpMapper) {
-
-		Assert.notNull(rest5Client, "restClient must not be null");
-
-		ElasticsearchTransport transport = getElasticsearchTransport(rest5Client, IMPERATIVE_CLIENT, transportOptions,
-				jsonpMapper);
-
-		return createImperative(transport);
-	}
-
 	/**
 	 * Creates a new {@link ElasticsearchClient} that uses the given {@link ElasticsearchTransport}.
 	 *
@@ -282,6 +220,96 @@ public final class ElasticsearchClients {
 	}
 	// endregion
 
+	// region low level RestClient
+	private static RestClientOptions.Builder getRestClientOptionsBuilder(@Nullable TransportOptions transportOptions) {
+
+		if (transportOptions instanceof RestClientOptions restClientOptions) {
+			return restClientOptions.toBuilder();
+		}
+
+		var builder = new RestClientOptions.Builder(RequestOptions.DEFAULT.toBuilder());
+
+		if (transportOptions != null) {
+			transportOptions.headers().forEach(header -> builder.addHeader(header.getKey(), header.getValue()));
+			transportOptions.queryParameters().forEach(builder::setParameter);
+			builder.onWarnings(transportOptions.onWarnings());
+		}
+
+		return builder;
+	}
+
+	/**
+	 * Creates a low level {@link RestClient} for the given configuration.
+	 *
+	 * @param clientConfiguration must not be {@literal null}
+	 * @return the {@link RestClient}
+	 */
+	public static RestClient getRestClient(ClientConfiguration clientConfiguration) {
+		return getRestClientBuilder(clientConfiguration).build();
+	}
+
+	private static RestClientBuilder getRestClientBuilder(ClientConfiguration clientConfiguration) {
+		HttpHost[] httpHosts = formattedHosts(clientConfiguration.getEndpoints(), clientConfiguration.useSsl()).stream()
+				.map(HttpHost::create).toArray(HttpHost[]::new);
+		RestClientBuilder builder = RestClient.builder(httpHosts);
+
+		if (clientConfiguration.getPathPrefix() != null) {
+			builder.setPathPrefix(clientConfiguration.getPathPrefix());
+		}
+
+		HttpHeaders headers = clientConfiguration.getDefaultHeaders();
+
+		if (!headers.isEmpty()) {
+			builder.setDefaultHeaders(toHeaderArray(headers));
+		}
+
+		builder.setHttpClientConfigCallback(clientBuilder -> {
+			if (clientConfiguration.getCaFingerprint().isPresent()) {
+				clientBuilder
+						.setSSLContext(TransportUtils.sslContextFromCaFingerprint(clientConfiguration.getCaFingerprint().get()));
+			}
+			clientConfiguration.getSslContext().ifPresent(clientBuilder::setSSLContext);
+			clientConfiguration.getHostNameVerifier().ifPresent(clientBuilder::setSSLHostnameVerifier);
+			clientBuilder.addInterceptorLast(new CustomHeaderInjector(clientConfiguration.getHeadersSupplier()));
+
+			RequestConfig.Builder requestConfigBuilder = RequestConfig.custom();
+			Duration connectTimeout = clientConfiguration.getConnectTimeout();
+
+			if (!connectTimeout.isNegative()) {
+				requestConfigBuilder.setConnectTimeout(Math.toIntExact(connectTimeout.toMillis()));
+			}
+
+			Duration socketTimeout = clientConfiguration.getSocketTimeout();
+
+			if (!socketTimeout.isNegative()) {
+				requestConfigBuilder.setSocketTimeout(Math.toIntExact(socketTimeout.toMillis()));
+				requestConfigBuilder.setConnectionRequestTimeout(Math.toIntExact(socketTimeout.toMillis()));
+			}
+
+			clientBuilder.setDefaultRequestConfig(requestConfigBuilder.build());
+
+			clientConfiguration.getProxy().map(HttpHost::create).ifPresent(clientBuilder::setProxy);
+
+			for (ClientConfiguration.ClientConfigurationCallback<?> clientConfigurer : clientConfiguration
+					.getClientConfigurers()) {
+				if (clientConfigurer instanceof ElasticsearchHttpClientConfigurationCallback restClientConfigurationCallback) {
+					clientBuilder = restClientConfigurationCallback.configure(clientBuilder);
+				}
+			}
+
+			return clientBuilder;
+		});
+
+		for (ClientConfiguration.ClientConfigurationCallback<?> clientConfigurationCallback : clientConfiguration
+				.getClientConfigurers()) {
+			if (clientConfigurationCallback instanceof ElasticsearchRestClientConfigurationCallback configurationCallback) {
+				builder = configurationCallback.configure(builder);
+			}
+		}
+		return builder;
+	}
+	// endregion
+
 	// region Elasticsearch transport
 	/**
 	 * Creates an {@link ElasticsearchTransport} that will use the given client that additionally is customized with a
@@ -292,9 +320,7 @@ public final class ElasticsearchClients {
 	 * @param transportOptions options for the transport
 	 * @param jsonpMapper mapper for the transport
 	 * @return ElasticsearchTransport
-	 * @deprecated since 6.0, use the version taking a Rest5Client
 	 */
-	@Deprecated(since = "6.0", forRemoval = true)
 	public static ElasticsearchTransport getElasticsearchTransport(RestClient restClient, String clientType,
 			@Nullable TransportOptions transportOptions, JsonpMapper jsonpMapper) {
 
@@ -303,7 +329,7 @@ public final class ElasticsearchClients {
 		Assert.notNull(jsonpMapper, "jsonpMapper must not be null");
 
 		TransportOptions.Builder transportOptionsBuilder = transportOptions != null ? transportOptions.toBuilder()
-				: new RestClientOptions(org.elasticsearch.client.RequestOptions.DEFAULT, false).toBuilder();
+				: new RestClientOptions(RequestOptions.DEFAULT, false).toBuilder();
 
 		RestClientOptions.Builder restClientOptionsBuilder = getRestClientOptionsBuilder(transportOptions);
 
@@ -327,35 +353,70 @@ public final class ElasticsearchClients {
 
 		return new RestClientTransport(restClient, jsonpMapper, restClientOptionsBuilder.build());
 	}
-
-	/**
-	 * Creates an {@link ElasticsearchTransport} that will use the given client that additionally is customized with a
-	 * header to contain the clientType
-	 *
-	 * @param rest5Client the client to use
-	 * @param clientType the client type to pass in each request as header
-	 * @param transportOptions options for the transport
-	 * @param jsonpMapper mapper for the transport
-	 * @return ElasticsearchTransport
-	 */
-	public static ElasticsearchTransport getElasticsearchTransport(Rest5Client rest5Client, String clientType,
-			@Nullable TransportOptions transportOptions, JsonpMapper jsonpMapper) {
-
-		Assert.notNull(rest5Client, "restClient must not be null");
-		Assert.notNull(clientType, "clientType must not be null");
-		Assert.notNull(jsonpMapper, "jsonpMapper must not be null");
-
-		TransportOptions.Builder transportOptionsBuilder = transportOptions != null ? transportOptions.toBuilder()
-				: new Rest5ClientOptions(RequestOptions.DEFAULT, false).toBuilder();
-
-		Rest5ClientOptions.Builder rest5ClientOptionsBuilder = getRest5ClientOptionsBuilder(transportOptions);
-
-		rest5ClientOptionsBuilder.addHeader(X_SPRING_DATA_ELASTICSEARCH_CLIENT,
-				VersionInfo.clientVersions() + " / " + clientType);
-
-		return new Rest5ClientTransport(rest5Client, jsonpMapper, rest5ClientOptionsBuilder.build());
-	}
 	// endregion
 
-	// todo #3117 remove and document that ElasticsearchHttpClientConfigurationCallback has been move to RestClients.
+	private static List<String> formattedHosts(List<InetSocketAddress> hosts, boolean useSsl) {
+		return hosts.stream().map(it -> (useSsl ? "https" : "http") + "://" + it.getHostString() + ':' + it.getPort())
+				.collect(Collectors.toList());
+	}
+
+	private static org.apache.http.Header[] toHeaderArray(HttpHeaders headers) {
+		return headers.entrySet().stream() //
+				.flatMap(entry -> entry.getValue().stream() //
+						.map(value -> new BasicHeader(entry.getKey(), value))) //
+				.toArray(org.apache.http.Header[]::new);
+	}
+
+	/**
+	 * Interceptor to inject custom supplied headers.
+	 *
+	 * @since 4.4
+	 */
+	private record CustomHeaderInjector(Supplier<HttpHeaders> headersSupplier) implements HttpRequestInterceptor {
+
+		@Override
+		public void process(HttpRequest request, HttpContext context) {
+			HttpHeaders httpHeaders = headersSupplier.get();
+
+			if (httpHeaders != null && !httpHeaders.isEmpty()) {
+				Arrays.stream(toHeaderArray(httpHeaders)).forEach(request::addHeader);
+			}
+		}
+	}
+
+	/**
+	 * {@link org.springframework.data.elasticsearch.client.ClientConfiguration.ClientConfigurationCallback} to configure
+	 * the Elasticsearch RestClient's Http client with a {@link HttpAsyncClientBuilder}
+	 *
+	 * @since 4.4
+	 */
+	public interface ElasticsearchHttpClientConfigurationCallback
+			extends ClientConfiguration.ClientConfigurationCallback<HttpAsyncClientBuilder> {
+
+		static ElasticsearchHttpClientConfigurationCallback from(
+				Function<HttpAsyncClientBuilder, HttpAsyncClientBuilder> httpClientBuilderCallback) {
+
+			Assert.notNull(httpClientBuilderCallback, "httpClientBuilderCallback must not be null");
+
+			return httpClientBuilderCallback::apply;
+		}
+	}
+
+	/**
+	 * {@link org.springframework.data.elasticsearch.client.ClientConfiguration.ClientConfigurationCallback} to configure
+	 * the RestClient client with a {@link RestClientBuilder}
+	 *
+	 * @since 5.0
+	 */
+	public interface ElasticsearchRestClientConfigurationCallback
+			extends ClientConfiguration.ClientConfigurationCallback<RestClientBuilder> {
+
+		static ElasticsearchRestClientConfigurationCallback from(
+				Function<RestClientBuilder, RestClientBuilder> restClientBuilderCallback) {
+
+			Assert.notNull(restClientBuilderCallback, "restClientBuilderCallback must not be null");
+
+			return restClientBuilderCallback::apply;
+		}
+	}
 }

src/main/java/org/springframework/data/elasticsearch/client/elc/ElasticsearchConfiguration.java

@@ -20,13 +20,12 @@ import co.elastic.clients.json.JsonpMapper;
 import co.elastic.clients.json.jackson.JacksonJsonpMapper;
 import co.elastic.clients.transport.ElasticsearchTransport;
 import co.elastic.clients.transport.TransportOptions;
-import co.elastic.clients.transport.rest5_client.Rest5ClientOptions;
+import co.elastic.clients.transport.rest_client.RestClientOptions;
-import co.elastic.clients.transport.rest5_client.low_level.RequestOptions;
-import co.elastic.clients.transport.rest5_client.low_level.Rest5Client;
 
+import org.elasticsearch.client.RequestOptions;
+import org.elasticsearch.client.RestClient;
 import org.springframework.context.annotation.Bean;
 import org.springframework.data.elasticsearch.client.ClientConfiguration;
-import org.springframework.data.elasticsearch.client.elc.rest5_client.Rest5Clients;
 import org.springframework.data.elasticsearch.config.ElasticsearchConfigurationSupport;
 import org.springframework.data.elasticsearch.core.ElasticsearchOperations;
 import org.springframework.data.elasticsearch.core.convert.ElasticsearchConverter;
@@ -39,9 +38,7 @@ import com.fasterxml.jackson.databind.SerializationFeature;
 /**
  * Base class for a @{@link org.springframework.context.annotation.Configuration} class to set up the Elasticsearch
  * connection using the Elasticsearch Client. This class exposes different parts of the setup as Spring beans. Deriving
- * classes must provide the {@link ClientConfiguration} to use. From Version 6.0 on, this class uses the new Rest5Client
+ * classes must provide the {@link ClientConfiguration} to use.
- * from Elasticsearch 9. The old implementation using the RestClient is still available under the name
- * {@link ElasticsearchLegacyRestClientConfiguration}.
  *
  * @author Peter-Josef Meisch
  * @since 4.4
@@ -63,27 +60,27 @@ public abstract class ElasticsearchConfiguration extends ElasticsearchConfigurat
 	 * @return RestClient
 	 */
 	@Bean
-	public Rest5Client elasticsearchRest5Client(ClientConfiguration clientConfiguration) {
+	public RestClient elasticsearchRestClient(ClientConfiguration clientConfiguration) {
 
 		Assert.notNull(clientConfiguration, "clientConfiguration must not be null");
 
-		return Rest5Clients.getRest5Client(clientConfiguration);
+		return ElasticsearchClients.getRestClient(clientConfiguration);
 	}
 
 	/**
-	 * Provides the Elasticsearch transport to be used. The default implementation uses the {@link Rest5Client} bean and
+	 * Provides the Elasticsearch transport to be used. The default implementation uses the {@link RestClient} bean and
 	 * the {@link JsonpMapper} bean provided in this class.
 	 *
 	 * @return the {@link ElasticsearchTransport}
 	 * @since 5.2
 	 */
 	@Bean
-	public ElasticsearchTransport elasticsearchTransport(Rest5Client rest5Client, JsonpMapper jsonpMapper) {
+	public ElasticsearchTransport elasticsearchTransport(RestClient restClient, JsonpMapper jsonpMapper) {
 
-		Assert.notNull(rest5Client, "restClient must not be null");
+		Assert.notNull(restClient, "restClient must not be null");
 		Assert.notNull(jsonpMapper, "jsonpMapper must not be null");
 
-		return ElasticsearchClients.getElasticsearchTransport(rest5Client, ElasticsearchClients.IMPERATIVE_CLIENT,
+		return ElasticsearchClients.getElasticsearchTransport(restClient, ElasticsearchClients.IMPERATIVE_CLIENT,
 				transportOptions(), jsonpMapper);
 	}
 
@@ -118,7 +115,7 @@ public abstract class ElasticsearchConfiguration extends ElasticsearchConfigurat
 	}
 
 	/**
-	 * Provides the JsonpMapper bean that is used in the {@link #elasticsearchTransport(Rest5Client, JsonpMapper)} method.
+	 * Provides the JsonpMapper bean that is used in the {@link #elasticsearchTransport(RestClient, JsonpMapper)} method.
 	 *
 	 * @return the {@link JsonpMapper} to use
 	 * @since 5.2
@@ -138,6 +135,6 @@ public abstract class ElasticsearchConfiguration extends ElasticsearchConfigurat
 	 * @return the options that should be added to every request. Must not be {@literal null}
 	 */
 	public TransportOptions transportOptions() {
-		return new Rest5ClientOptions(RequestOptions.DEFAULT, false);
+		return new RestClientOptions(RequestOptions.DEFAULT, false);
 	}
 }

src/main/java/org/springframework/data/elasticsearch/client/elc/ElasticsearchExceptionTranslator.java

@@ -119,19 +119,14 @@ public class ElasticsearchExceptionTranslator implements PersistenceExceptionTra
 		String message = null;
 
 		if (exception instanceof ResponseException responseException) {
-			// this code is for the old RestClient
 			status = responseException.getResponse().getStatusLine().getStatusCode();
 			message = responseException.getMessage();
-		} else if (exception instanceof ElasticsearchException elasticsearchException) {
-			// using the RestClient throws this
-			status = elasticsearchException.status();
-			message = elasticsearchException.getMessage();
 		} else if (exception.getCause() != null) {
 			checkForConflictException(exception.getCause());
 		}
 
 		if (status != null && message != null) {
-			if (status == 409 && message.contains("version_conflict_engine_exception"))
+			if (status == 409 && message.contains("type\":\"version_conflict_engine_exception"))
 				if (message.contains("version conflict, required seqNo")) {
 					throw new OptimisticLockingFailureException("Cannot index a document due to seq_no+primary_term conflict",
 							exception);

src/main/java/org/springframework/data/elasticsearch/client/elc/ElasticsearchLegacyRestClientConfiguration.java

@@ -1,144 +0,0 @@
-/*
- * Copyright 2021-2025 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.springframework.data.elasticsearch.client.elc;
-
-import co.elastic.clients.elasticsearch.ElasticsearchClient;
-import co.elastic.clients.json.JsonpMapper;
-import co.elastic.clients.json.jackson.JacksonJsonpMapper;
-import co.elastic.clients.transport.ElasticsearchTransport;
-import co.elastic.clients.transport.TransportOptions;
-import co.elastic.clients.transport.rest_client.RestClientOptions;
-
-import org.elasticsearch.client.RequestOptions;
-import org.elasticsearch.client.RestClient;
-import org.springframework.context.annotation.Bean;
-import org.springframework.data.elasticsearch.client.ClientConfiguration;
-import org.springframework.data.elasticsearch.client.elc.rest_client.RestClients;
-import org.springframework.data.elasticsearch.config.ElasticsearchConfigurationSupport;
-import org.springframework.data.elasticsearch.core.ElasticsearchOperations;
-import org.springframework.data.elasticsearch.core.convert.ElasticsearchConverter;
-import org.springframework.util.Assert;
-
-import com.fasterxml.jackson.annotation.JsonInclude;
-import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.SerializationFeature;
-
-/**
- * Base class for a @{@link org.springframework.context.annotation.Configuration} class to set up the Elasticsearch
- * connection using the Elasticsearch Client. This class exposes different parts of the setup as Spring beans. Deriving
- * classes must provide the {@link ClientConfiguration} to use. <br/>
- * This class uses the Elasticsearch RestClient which was replaced by the Rest5Client in Elasticsearch 9. It is still
- * available here but deprecated.
- *
- * @author Peter-Josef Meisch
- * @since 4.4
- * @deprecated since 6.0, use {@link ElasticsearchConfiguration}
- */
-@Deprecated(since = "6.0", forRemoval=true)
-public abstract class ElasticsearchLegacyRestClientConfiguration extends ElasticsearchConfigurationSupport {
-
-	/**
-	 * Must be implemented by deriving classes to provide the {@link ClientConfiguration}.
-	 *
-	 * @return configuration, must not be {@literal null}
-	 */
-	@Bean(name = "elasticsearchClientConfiguration")
-	public abstract ClientConfiguration clientConfiguration();
-
-	/**
-	 * Provides the underlying low level Elasticsearch RestClient.
-	 *
-	 * @param clientConfiguration configuration for the client, must not be {@literal null}
-	 * @return RestClient
-	 */
-	@Bean
-	public RestClient elasticsearchRestClient(ClientConfiguration clientConfiguration) {
-
-		Assert.notNull(clientConfiguration, "clientConfiguration must not be null");
-
-		return RestClients.getRestClient(clientConfiguration);
-	}
-
-	/**
-	 * Provides the Elasticsearch transport to be used. The default implementation uses the {@link RestClient} bean and
-	 * the {@link JsonpMapper} bean provided in this class.
-	 *
-	 * @return the {@link ElasticsearchTransport}
-	 * @since 5.2
-	 */
-	@Bean
-	public ElasticsearchTransport elasticsearchTransport(RestClient restClient, JsonpMapper jsonpMapper) {
-
-		Assert.notNull(restClient, "restClient must not be null");
-		Assert.notNull(jsonpMapper, "jsonpMapper must not be null");
-
-		return ElasticsearchClients.getElasticsearchTransport(restClient, ElasticsearchClients.IMPERATIVE_CLIENT,
-				transportOptions(), jsonpMapper);
-	}
-
-	/**
-	 * Provides the {@link ElasticsearchClient} to be used.
-	 *
-	 * @param transport the {@link ElasticsearchTransport} to use
-	 * @return ElasticsearchClient instance
-	 */
-	@Bean
-	public ElasticsearchClient elasticsearchClient(ElasticsearchTransport transport) {
-
-		Assert.notNull(transport, "transport must not be null");
-
-		return ElasticsearchClients.createImperative(transport);
-	}
-
-	/**
-	 * Creates a {@link ElasticsearchOperations} implementation using an {@link ElasticsearchClient}.
-	 *
-	 * @return never {@literal null}.
-	 */
-	@Bean(name = { "elasticsearchOperations", "elasticsearchTemplate" })
-	public ElasticsearchOperations elasticsearchOperations(ElasticsearchConverter elasticsearchConverter,
-			ElasticsearchClient elasticsearchClient) {
-
-		ElasticsearchTemplate template = new ElasticsearchTemplate(elasticsearchClient, elasticsearchConverter);
-		template.setRefreshPolicy(refreshPolicy());
-
-		return template;
-	}
-
-	/**
-	 * Provides the JsonpMapper bean that is used in the {@link #elasticsearchTransport(RestClient, JsonpMapper)} method.
-	 *
-	 * @return the {@link JsonpMapper} to use
-	 * @since 5.2
-	 */
-	@Bean
-	public JsonpMapper jsonpMapper() {
-		// we need to create our own objectMapper that keeps null values in order to provide the storeNullValue
-		// functionality. The one Elasticsearch would provide removes the nulls. We remove unwanted nulls before they get
-		// into this mapper, so we can safely keep them here.
-		var objectMapper = (new ObjectMapper())
-				.configure(SerializationFeature.INDENT_OUTPUT, false)
-				.setSerializationInclusion(JsonInclude.Include.ALWAYS);
-		return new JacksonJsonpMapper(objectMapper);
-	}
-
-	/**
-	 * @return the options that should be added to every request. Must not be {@literal null}
-	 */
-	public TransportOptions transportOptions() {
-		return new RestClientOptions(RequestOptions.DEFAULT, false);
-	}
-}

src/main/java/org/springframework/data/elasticsearch/client/elc/ElasticsearchTemplate.java

@@ -40,7 +40,6 @@ import java.util.stream.Collectors;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.BulkFailureException;
 import org.springframework.data.elasticsearch.client.UnsupportedBackendOperation;
 import org.springframework.data.elasticsearch.core.AbstractElasticsearchTemplate;
@@ -60,6 +59,7 @@ import org.springframework.data.elasticsearch.core.reindex.ReindexRequest;
 import org.springframework.data.elasticsearch.core.reindex.ReindexResponse;
 import org.springframework.data.elasticsearch.core.script.Script;
 import org.springframework.data.elasticsearch.core.sql.SqlResponse;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**
@@ -181,6 +181,19 @@ public class ElasticsearchTemplate extends AbstractElasticsearchTemplate {
 		return delete(query, clazz, getIndexCoordinatesFor(clazz));
 	}
 
+	@Override
+	public ByQueryResponse delete(Query query, Class<?> clazz, IndexCoordinates index) {
+
+		Assert.notNull(query, "query must not be null");
+
+		DeleteByQueryRequest request = requestConverter.documentDeleteByQueryRequest(query, routingResolver.getRouting(),
+				clazz, index, getRefreshPolicy());
+
+		DeleteByQueryResponse response = execute(client -> client.deleteByQuery(request));
+
+		return responseConverter.byQueryResponse(response);
+	}
+
 	@Override
 	public ByQueryResponse delete(DeleteQuery query, Class<?> clazz, IndexCoordinates index) {
 		Assert.notNull(query, "query must not be null");

src/main/java/org/springframework/data/elasticsearch/client/elc/HighlightQueryBuilder.java

@@ -20,7 +20,6 @@ import static org.springframework.data.elasticsearch.client.elc.TypeUtils.*;
 import java.util.Arrays;
 import java.util.stream.Collectors;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.mapping.ElasticsearchPersistentEntity;
 import org.springframework.data.elasticsearch.core.mapping.ElasticsearchPersistentProperty;
 import org.springframework.data.elasticsearch.core.query.highlight.Highlight;
@@ -28,6 +27,7 @@ import org.springframework.data.elasticsearch.core.query.highlight.HighlightFiel
 import org.springframework.data.elasticsearch.core.query.highlight.HighlightFieldParameters;
 import org.springframework.data.elasticsearch.core.query.highlight.HighlightParameters;
 import org.springframework.data.mapping.context.MappingContext;
+import org.springframework.lang.Nullable;
 import org.springframework.util.StringUtils;
 
 /**
@@ -43,8 +43,7 @@ class HighlightQueryBuilder {
 	private final RequestConverter requestConverter;
 
 	HighlightQueryBuilder(
-			MappingContext<? extends ElasticsearchPersistentEntity<?>, ElasticsearchPersistentProperty> mappingContext,
+			MappingContext<? extends ElasticsearchPersistentEntity<?>, ElasticsearchPersistentProperty> mappingContext, RequestConverter requestConverter) {
-			RequestConverter requestConverter) {
 		this.mappingContext = mappingContext;
 		this.requestConverter = requestConverter;
 	}

src/main/java/org/springframework/data/elasticsearch/client/elc/IndicesTemplate.java

@@ -27,7 +27,6 @@ import java.util.Map;
 import java.util.Objects;
 import java.util.Set;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.core.annotation.AnnotatedElementUtils;
 import org.springframework.dao.InvalidDataAccessApiUsageException;
 import org.springframework.data.elasticsearch.UncategorizedElasticsearchException;
@@ -50,6 +49,7 @@ import org.springframework.data.elasticsearch.core.mapping.Alias;
 import org.springframework.data.elasticsearch.core.mapping.CreateIndexSettings;
 import org.springframework.data.elasticsearch.core.mapping.ElasticsearchPersistentEntity;
 import org.springframework.data.elasticsearch.core.mapping.IndexCoordinates;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**

src/main/java/org/springframework/data/elasticsearch/client/elc/JsonUtils.java

@@ -23,7 +23,7 @@ import java.nio.charset.StandardCharsets;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-import org.jspecify.annotations.Nullable;
+import org.springframework.lang.Nullable;
 
 /**
  * @author Peter-Josef Meisch
@@ -48,7 +48,7 @@ final class JsonUtils {
 	}
 
 	@Nullable
-	public static String queryToJson(co.elastic.clients.elasticsearch._types.query_dsl.@Nullable Query query,
+	public static String queryToJson(@Nullable co.elastic.clients.elasticsearch._types.query_dsl.Query query,
 			JsonpMapper mapper) {
 
 		if (query == null) {

src/main/java/org/springframework/data/elasticsearch/client/elc/NativeQuery.java

@@ -28,8 +28,8 @@ import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.query.BaseQuery;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**
@@ -44,7 +44,7 @@ import org.springframework.util.Assert;
 public class NativeQuery extends BaseQuery {
 
 	@Nullable private final Query query;
-	private org.springframework.data.elasticsearch.core.query.@Nullable Query springDataQuery;
+	@Nullable private org.springframework.data.elasticsearch.core.query.Query springDataQuery;
 	@Nullable private Query filter;
 	// note: the new client does not have pipeline aggs, these are just set up as normal aggs
 	private final Map<String, Aggregation> aggregations = new LinkedHashMap<>();
@@ -117,7 +117,7 @@ public class NativeQuery extends BaseQuery {
 	 * @see NativeQueryBuilder#withQuery(org.springframework.data.elasticsearch.core.query.Query).
 	 * @since 5.1
 	 */
-	public void setSpringDataQuery(org.springframework.data.elasticsearch.core.query.@Nullable Query springDataQuery) {
+	public void setSpringDataQuery(@Nullable org.springframework.data.elasticsearch.core.query.Query springDataQuery) {
 		this.springDataQuery = springDataQuery;
 	}
 
@@ -129,7 +129,8 @@ public class NativeQuery extends BaseQuery {
 		return knnSearches;
 	}
 
-	public org.springframework.data.elasticsearch.core.query.@Nullable Query getSpringDataQuery() {
+	@Nullable
+	public org.springframework.data.elasticsearch.core.query.Query getSpringDataQuery() {
 		return springDataQuery;
 	}
 }

src/main/java/org/springframework/data/elasticsearch/client/elc/NativeQueryBuilder.java

@@ -33,8 +33,8 @@ import java.util.List;
 import java.util.Map;
 import java.util.function.Function;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.query.BaseQueryBuilder;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**
@@ -53,7 +53,7 @@ public class NativeQueryBuilder extends BaseQueryBuilder<NativeQuery, NativeQuer
 	private final List<SortOptions> sortOptions = new ArrayList<>();
 	private final Map<String, JsonData> searchExtensions = new LinkedHashMap<>();
 
-	private org.springframework.data.elasticsearch.core.query.@Nullable Query springDataQuery;
+	@Nullable private org.springframework.data.elasticsearch.core.query.Query springDataQuery;
 	@Nullable private KnnQuery knnQuery;
 	@Nullable private List<KnnSearch> knnSearches = Collections.emptyList();
 
@@ -104,7 +104,8 @@ public class NativeQueryBuilder extends BaseQueryBuilder<NativeQuery, NativeQuer
 		return knnSearches;
 	}
 
-	public org.springframework.data.elasticsearch.core.query.@Nullable Query getSpringDataQuery() {
+	@Nullable
+	public org.springframework.data.elasticsearch.core.query.Query getSpringDataQuery() {
 		return springDataQuery;
 	}
 

src/main/java/org/springframework/data/elasticsearch/client/elc/Queries.java

@@ -34,9 +34,9 @@ import java.util.Base64;
 import java.util.List;
 import java.util.function.Function;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.geo.GeoPoint;
 import org.springframework.data.elasticsearch.core.query.BaseQueryBuilder;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**

src/main/java/org/springframework/data/elasticsearch/client/elc/ReactiveElasticsearchClient.java

@@ -30,7 +30,7 @@ import reactor.core.publisher.Mono;
 import java.io.IOException;
 import java.util.function.Function;
 
-import org.jspecify.annotations.Nullable;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**

src/main/java/org/springframework/data/elasticsearch/client/elc/ReactiveElasticsearchClusterClient.java

@@ -16,15 +16,7 @@
 package org.springframework.data.elasticsearch.client.elc;
 
 import co.elastic.clients.ApiClient;
-import co.elastic.clients.elasticsearch.cluster.DeleteComponentTemplateRequest;
+import co.elastic.clients.elasticsearch.cluster.*;
-import co.elastic.clients.elasticsearch.cluster.DeleteComponentTemplateResponse;
-import co.elastic.clients.elasticsearch.cluster.ExistsComponentTemplateRequest;
-import co.elastic.clients.elasticsearch.cluster.GetComponentTemplateRequest;
-import co.elastic.clients.elasticsearch.cluster.GetComponentTemplateResponse;
-import co.elastic.clients.elasticsearch.cluster.HealthRequest;
-import co.elastic.clients.elasticsearch.cluster.HealthResponse;
-import co.elastic.clients.elasticsearch.cluster.PutComponentTemplateRequest;
-import co.elastic.clients.elasticsearch.cluster.PutComponentTemplateResponse;
 import co.elastic.clients.transport.ElasticsearchTransport;
 import co.elastic.clients.transport.TransportOptions;
 import co.elastic.clients.transport.endpoints.BooleanResponse;
@@ -33,7 +25,7 @@ import reactor.core.publisher.Mono;
 
 import java.util.function.Function;
 
-import org.jspecify.annotations.Nullable;
+import org.springframework.lang.Nullable;
 
 /**
  * Reactive version of the {@link co.elastic.clients.elasticsearch.cluster.ElasticsearchClusterClient}

src/main/java/org/springframework/data/elasticsearch/client/elc/ReactiveElasticsearchConfiguration.java

@@ -19,18 +19,12 @@ import co.elastic.clients.json.JsonpMapper;
 import co.elastic.clients.json.jackson.JacksonJsonpMapper;
 import co.elastic.clients.transport.ElasticsearchTransport;
 import co.elastic.clients.transport.TransportOptions;
-import co.elastic.clients.transport.rest5_client.Rest5ClientOptions;
-import co.elastic.clients.transport.rest5_client.low_level.RequestOptions;
-import co.elastic.clients.transport.rest5_client.low_level.Rest5Client;
 import co.elastic.clients.transport.rest_client.RestClientOptions;
 
-import com.fasterxml.jackson.annotation.JsonInclude;
+import org.elasticsearch.client.RequestOptions;
-import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.SerializationFeature;
 import org.elasticsearch.client.RestClient;
 import org.springframework.context.annotation.Bean;
 import org.springframework.data.elasticsearch.client.ClientConfiguration;
-import org.springframework.data.elasticsearch.client.elc.rest5_client.Rest5Clients;
 import org.springframework.data.elasticsearch.config.ElasticsearchConfigurationSupport;
 import org.springframework.data.elasticsearch.core.ReactiveElasticsearchOperations;
 import org.springframework.data.elasticsearch.core.convert.ElasticsearchConverter;
@@ -61,11 +55,11 @@ public abstract class ReactiveElasticsearchConfiguration extends ElasticsearchCo
 	 * @return RestClient
 	 */
 	@Bean
-	public Rest5Client elasticsearchRestClient(ClientConfiguration clientConfiguration) {
+	public RestClient elasticsearchRestClient(ClientConfiguration clientConfiguration) {
 
 		Assert.notNull(clientConfiguration, "clientConfiguration must not be null");
 
-		return Rest5Clients.getRest5Client(clientConfiguration);
+		return ElasticsearchClients.getRestClient(clientConfiguration);
 	}
 
 	/**
@@ -76,12 +70,12 @@ public abstract class ReactiveElasticsearchConfiguration extends ElasticsearchCo
 	 * @since 5.2
 	 */
 	@Bean
-	public ElasticsearchTransport elasticsearchTransport(Rest5Client rest5Client, JsonpMapper jsonpMapper) {
+	public ElasticsearchTransport elasticsearchTransport(RestClient restClient, JsonpMapper jsonpMapper) {
 
-		Assert.notNull(rest5Client, "restClient must not be null");
+		Assert.notNull(restClient, "restClient must not be null");
 		Assert.notNull(jsonpMapper, "jsonpMapper must not be null");
 
-		return ElasticsearchClients.getElasticsearchTransport(rest5Client, ElasticsearchClients.REACTIVE_CLIENT,
+		return ElasticsearchClients.getElasticsearchTransport(restClient, ElasticsearchClients.REACTIVE_CLIENT,
 				transportOptions(), jsonpMapper);
 	}
 
@@ -116,7 +110,7 @@ public abstract class ReactiveElasticsearchConfiguration extends ElasticsearchCo
 	}
 
 	/**
-	 * Provides the JsonpMapper that is used in the {@link #elasticsearchTransport(Rest5Client, JsonpMapper)} method and
+	 * Provides the JsonpMapper that is used in the {@link #elasticsearchTransport(RestClient, JsonpMapper)} method and
 	 * exposes it as a bean.
 	 *
 	 * @return the {@link JsonpMapper} to use
@@ -124,19 +118,13 @@ public abstract class ReactiveElasticsearchConfiguration extends ElasticsearchCo
 	 */
 	@Bean
 	public JsonpMapper jsonpMapper() {
-		// we need to create our own objectMapper that keeps null values in order to provide the storeNullValue
+		return new JacksonJsonpMapper();
-		// functionality. The one Elasticsearch would provide removes the nulls. We remove unwanted nulls before they get
-		// into this mapper, so we can safely keep them here.
-		var objectMapper = (new ObjectMapper())
-				.configure(SerializationFeature.INDENT_OUTPUT, false)
-				.setSerializationInclusion(JsonInclude.Include.ALWAYS);
-		return new JacksonJsonpMapper(objectMapper);
 	}
 
 	/**
 	 * @return the options that should be added to every request. Must not be {@literal null}
 	 */
 	public TransportOptions transportOptions() {
-		return new Rest5ClientOptions(RequestOptions.DEFAULT, false);
+		return new RestClientOptions(RequestOptions.DEFAULT, false).toBuilder().build();
 	}
 }

src/main/java/org/springframework/data/elasticsearch/client/elc/ReactiveElasticsearchIndicesClient.java

@@ -25,7 +25,7 @@ import reactor.core.publisher.Mono;
 
 import java.util.function.Function;
 
-import org.jspecify.annotations.Nullable;
+import org.springframework.lang.Nullable;
 
 /**
  * Reactive version of the {@link co.elastic.clients.elasticsearch.indices.ElasticsearchIndicesClient}
@@ -539,6 +539,14 @@ public class ReactiveElasticsearchIndicesClient
 		return stats(builder -> builder);
 	}
 
+	public Mono<UnfreezeResponse> unfreeze(UnfreezeRequest request) {
+		return Mono.fromFuture(transport.performRequestAsync(request, UnfreezeRequest._ENDPOINT, transportOptions));
+	}
+
+	public Mono<UnfreezeResponse> unfreeze(Function<UnfreezeRequest.Builder, ObjectBuilder<UnfreezeRequest>> fn) {
+		return unfreeze(fn.apply(new UnfreezeRequest.Builder()).build());
+	}
+
 	public Mono<UpdateAliasesResponse> updateAliases(UpdateAliasesRequest request) {
 		return Mono.fromFuture(transport.performRequestAsync(request, UpdateAliasesRequest._ENDPOINT, transportOptions));
 	}

src/main/java/org/springframework/data/elasticsearch/client/elc/ReactiveElasticsearchLegacyRestClientConfiguration.java

@@ -1,144 +0,0 @@
-/*
- * Copyright 2021-2025 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.springframework.data.elasticsearch.client.elc;
-
-import co.elastic.clients.json.JsonpMapper;
-import co.elastic.clients.json.jackson.JacksonJsonpMapper;
-import co.elastic.clients.transport.ElasticsearchTransport;
-import co.elastic.clients.transport.TransportOptions;
-import co.elastic.clients.transport.rest_client.RestClientOptions;
-
-import com.fasterxml.jackson.annotation.JsonInclude;
-import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.SerializationFeature;
-import org.elasticsearch.client.RequestOptions;
-import org.elasticsearch.client.RestClient;
-import org.springframework.context.annotation.Bean;
-import org.springframework.data.elasticsearch.client.ClientConfiguration;
-import org.springframework.data.elasticsearch.client.elc.rest_client.RestClients;
-import org.springframework.data.elasticsearch.config.ElasticsearchConfigurationSupport;
-import org.springframework.data.elasticsearch.core.ReactiveElasticsearchOperations;
-import org.springframework.data.elasticsearch.core.convert.ElasticsearchConverter;
-import org.springframework.util.Assert;
-
-/**
- * Base class for a @{@link org.springframework.context.annotation.Configuration} class to set up the Elasticsearch
- * connection using the {@link ReactiveElasticsearchClient}. This class exposes different parts of the setup as Spring
- * beans. Deriving * classes must provide the {@link ClientConfiguration} to use. <br/>
- * This class uses the Elasticsearch RestClient which was replaced b y the Rest5Client in Elasticsearch 9. It is still
- * available here but deprecated. *
- *
- * @author Peter-Josef Meisch
- * @since 4.4
- * @deprecated since 6.0 use {@link ReactiveElasticsearchConfiguration}
- */
-@Deprecated(since = "6.0", forRemoval=true)
-public abstract class ReactiveElasticsearchLegacyRestClientConfiguration extends ElasticsearchConfigurationSupport {
-
-	/**
-	 * Must be implemented by deriving classes to provide the {@link ClientConfiguration}.
-	 *
-	 * @return configuration, must not be {@literal null}
-	 */
-	@Bean(name = "elasticsearchClientConfiguration")
-	public abstract ClientConfiguration clientConfiguration();
-
-	/**
-	 * Provides the underlying low level RestClient.
-	 *
-	 * @param clientConfiguration configuration for the client, must not be {@literal null}
-	 * @return RestClient
-	 */
-	@Bean
-	public RestClient elasticsearchRestClient(ClientConfiguration clientConfiguration) {
-
-		Assert.notNull(clientConfiguration, "clientConfiguration must not be null");
-
-		return RestClients.getRestClient(clientConfiguration);
-	}
-
-	/**
-	 * Provides the Elasticsearch transport to be used. The default implementation uses the {@link RestClient} bean and
-	 * the {@link JsonpMapper} bean provided in this class.
-	 *
-	 * @return the {@link ElasticsearchTransport}
-	 * @since 5.2
-	 */
-	@Bean
-	public ElasticsearchTransport elasticsearchTransport(RestClient restClient, JsonpMapper jsonpMapper) {
-
-		Assert.notNull(restClient, "restClient must not be null");
-		Assert.notNull(jsonpMapper, "jsonpMapper must not be null");
-
-		return ElasticsearchClients.getElasticsearchTransport(restClient, ElasticsearchClients.REACTIVE_CLIENT,
-				transportOptions(), jsonpMapper);
-	}
-
-	/**
-	 * Provides the {@link ReactiveElasticsearchClient} instance used.
-	 *
-	 * @param transport the ElasticsearchTransport to use
-	 * @return ReactiveElasticsearchClient instance.
-	 */
-	@Bean
-	public ReactiveElasticsearchClient reactiveElasticsearchClient(ElasticsearchTransport transport) {
-
-		Assert.notNull(transport, "transport must not be null");
-
-		return ElasticsearchClients.createReactive(transport);
-	}
-
-	/**
-	 * Creates {@link ReactiveElasticsearchOperations}.
-	 *
-	 * @return never {@literal null}.
-	 */
-	@Bean(name = { "reactiveElasticsearchOperations", "reactiveElasticsearchTemplate" })
-	public ReactiveElasticsearchOperations reactiveElasticsearchOperations(ElasticsearchConverter elasticsearchConverter,
-			ReactiveElasticsearchClient reactiveElasticsearchClient) {
-
-		ReactiveElasticsearchTemplate template = new ReactiveElasticsearchTemplate(reactiveElasticsearchClient,
-				elasticsearchConverter);
-		template.setRefreshPolicy(refreshPolicy());
-
-		return template;
-	}
-
-	/**
-	 * Provides the JsonpMapper that is used in the {@link #elasticsearchTransport(RestClient, JsonpMapper)} method and
-	 * exposes it as a bean.
-	 *
-	 * @return the {@link JsonpMapper} to use
-	 * @since 5.2
-	 */
-	@Bean
-	public JsonpMapper jsonpMapper() {
-		// we need to create our own objectMapper that keeps null values in order to provide the storeNullValue
-		// functionality. The one Elasticsearch would provide removes the nulls. We remove unwanted nulls before they get
-		// into this mapper, so we can safely keep them here.
-		var objectMapper = (new ObjectMapper())
-				.configure(SerializationFeature.INDENT_OUTPUT, false)
-				.setSerializationInclusion(JsonInclude.Include.ALWAYS);
-		return new JacksonJsonpMapper(objectMapper);
-	}
-
-	/**
-	 * @return the options that should be added to every request. Must not be {@literal null}
-	 */
-	public TransportOptions transportOptions() {
-		return new RestClientOptions(RequestOptions.DEFAULT, false).toBuilder().build();
-	}
-}

src/main/java/org/springframework/data/elasticsearch/client/elc/ReactiveElasticsearchTemplate.java

@@ -40,7 +40,6 @@ import java.util.stream.Collectors;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-import org.jspecify.annotations.Nullable;
 import org.reactivestreams.Publisher;
 import org.springframework.data.domain.Sort;
 import org.springframework.data.elasticsearch.BulkFailureException;
@@ -64,6 +63,7 @@ import org.springframework.data.elasticsearch.core.reindex.ReindexRequest;
 import org.springframework.data.elasticsearch.core.reindex.ReindexResponse;
 import org.springframework.data.elasticsearch.core.script.Script;
 import org.springframework.data.elasticsearch.core.sql.SqlResponse;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.CollectionUtils;
 import org.springframework.util.StringUtils;
@@ -167,6 +167,16 @@ public class ReactiveElasticsearchTemplate extends AbstractReactiveElasticsearch
 				.onErrorReturn(NoSuchIndexException.class, false);
 	}
 
+	@Override
+	public Mono<ByQueryResponse> delete(Query query, Class<?> entityType, IndexCoordinates index) {
+
+		Assert.notNull(query, "query must not be null");
+
+		DeleteByQueryRequest request = requestConverter.documentDeleteByQueryRequest(query, routingResolver.getRouting(),
+				entityType, index, getRefreshPolicy());
+		return Mono.from(execute(client -> client.deleteByQuery(request))).map(responseConverter::byQueryResponse);
+	}
+
 	@Override
 	public Mono<ByQueryResponse> delete(DeleteQuery query, Class<?> entityType, IndexCoordinates index) {
 		Assert.notNull(query, "query must not be null");

src/main/java/org/springframework/data/elasticsearch/client/elc/ReactiveIndicesTemplate.java

@@ -29,7 +29,6 @@ import java.util.Map;
 import java.util.Objects;
 import java.util.Set;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.core.annotation.AnnotatedElementUtils;
 import org.springframework.dao.InvalidDataAccessApiUsageException;
 import org.springframework.data.elasticsearch.NoSuchIndexException;
@@ -52,6 +51,7 @@ import org.springframework.data.elasticsearch.core.mapping.Alias;
 import org.springframework.data.elasticsearch.core.mapping.CreateIndexSettings;
 import org.springframework.data.elasticsearch.core.mapping.ElasticsearchPersistentEntity;
 import org.springframework.data.elasticsearch.core.mapping.IndexCoordinates;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**

src/main/java/org/springframework/data/elasticsearch/client/elc/RequestConverter.java

@@ -42,10 +42,10 @@ import co.elastic.clients.elasticsearch.core.bulk.CreateOperation;
 import co.elastic.clients.elasticsearch.core.bulk.IndexOperation;
 import co.elastic.clients.elasticsearch.core.bulk.UpdateOperation;
 import co.elastic.clients.elasticsearch.core.mget.MultiGetOperation;
+import co.elastic.clients.elasticsearch.core.msearch.MultisearchBody;
 import co.elastic.clients.elasticsearch.core.msearch.MultisearchHeader;
 import co.elastic.clients.elasticsearch.core.search.Highlight;
 import co.elastic.clients.elasticsearch.core.search.Rescore;
-import co.elastic.clients.elasticsearch.core.search.SearchRequestBody;
 import co.elastic.clients.elasticsearch.core.search.SourceConfig;
 import co.elastic.clients.elasticsearch.indices.*;
 import co.elastic.clients.elasticsearch.indices.ExistsIndexTemplateRequest;
@@ -55,7 +55,6 @@ import co.elastic.clients.elasticsearch.sql.query.SqlFormat;
 import co.elastic.clients.json.JsonData;
 import co.elastic.clients.json.JsonpDeserializer;
 import co.elastic.clients.json.JsonpMapper;
-import co.elastic.clients.util.NamedValue;
 import co.elastic.clients.util.ObjectBuilder;
 import jakarta.json.stream.JsonParser;
 
@@ -73,12 +72,10 @@ import java.util.Objects;
 import java.util.Set;
 import java.util.function.Function;
 import java.util.stream.Collectors;
-import java.util.stream.Stream;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.jetbrains.annotations.NotNull;
-import org.jspecify.annotations.Nullable;
 import org.springframework.dao.InvalidDataAccessApiUsageException;
 import org.springframework.data.domain.Sort;
 import org.springframework.data.elasticsearch.core.RefreshPolicy;
@@ -102,6 +99,7 @@ import org.springframework.data.elasticsearch.core.reindex.ReindexRequest;
 import org.springframework.data.elasticsearch.core.reindex.Remote;
 import org.springframework.data.elasticsearch.core.script.Script;
 import org.springframework.data.elasticsearch.support.DefaultStringObjectMap;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.CollectionUtils;
 import org.springframework.util.StringUtils;
@@ -738,7 +736,8 @@ class RequestConverter extends AbstractQueryProcessor {
 		return uob.build();
 	}
 
-	private co.elastic.clients.elasticsearch._types.@Nullable Script getScript(@Nullable ScriptData scriptData) {
+	@Nullable
+	private co.elastic.clients.elasticsearch._types.Script getScript(@Nullable ScriptData scriptData) {
 
 		if (scriptData == null) {
 			return null;
@@ -751,10 +750,11 @@ class RequestConverter extends AbstractQueryProcessor {
 		}
 		return co.elastic.clients.elasticsearch._types.Script.of(sb -> {
 			sb.lang(scriptData.language())
-			  	.params(params)
+					.params(params);
-				.id(scriptData.scriptName());
+			if (scriptData.type() == ScriptType.INLINE) {
-			if (scriptData.script() != null){
+				sb.source(scriptData.script());
-				sb.source(s -> s.scriptString(scriptData.script()));
+			} else if (scriptData.type() == ScriptType.STORED) {
+				sb.id(scriptData.script());
 			}
 			return sb;
 		});
@@ -926,13 +926,9 @@ class RequestConverter extends AbstractQueryProcessor {
 
 		ReindexRequest.Script script = reindexRequest.getScript();
 		if (script != null) {
-			builder.script(sb -> {
+			builder.script(sb -> sb
-				if (script.getSource() != null){
+					.lang(script.getLang())
-					sb.source(s -> s.scriptString(script.getSource()));
+					.source(script.getSource()));
-				}
-				sb.lang(script.getLang());
-				return sb;
-			});
 		}
 
 		builder.timeout(time(reindexRequest.getTimeout())) //
@@ -1089,11 +1085,12 @@ class RequestConverter extends AbstractQueryProcessor {
 
 				uqb.script(sb -> {
 					sb.lang(query.getLang()).params(params);
-					if (query.getScript() != null){
-						sb.source(s -> s.scriptString(query.getScript()));
-					}
-					sb.id(query.getId());
 
+					if (query.getScriptType() == ScriptType.INLINE) {
+						sb.source(query.getScript()); //
+					} else if (query.getScriptType() == ScriptType.STORED) {
+						sb.id(query.getScript());
+					}
 					return sb;
 				});
 			}
@@ -1256,11 +1253,11 @@ class RequestConverter extends AbstractQueryProcessor {
 				mtrb.searchTemplates(stb -> stb
 						.header(msearchHeaderBuilder(query, param.index(), routing))
 						.body(bb -> {
-							bb.explain(query.getExplain()) //
+							bb //
-								.id(query.getId()); //
+									.explain(query.getExplain()) //
-							if (query.getSource() != null){
+									.id(query.getId()) //
-								bb.source(s -> s.scriptString(query.getSource()));
+									.source(query.getSource()) //
-							}
+							;
 
 							if (!CollectionUtils.isEmpty(query.getParams())) {
 								Map<String, JsonData> params = getTemplateParams(query.getParams().entrySet());
@@ -1296,15 +1293,11 @@ class RequestConverter extends AbstractQueryProcessor {
 									.timeout(timeStringMs(query.getTimeout())) //
 							;
 
-							var offset = query.getPageable().isPaged() ? query.getPageable().getOffset() : 0;
+							if (query.getPageable().isPaged()) {
-							var pageSize = query.getPageable().isPaged() ? query.getPageable().getPageSize()
+								bb //
-									: INDEX_MAX_RESULT_WINDOW;
+										.from((int) query.getPageable().getOffset()) //
-							// if we have both a page size and a max results, we take the min, this is necessary for
+										.size(query.getPageable().getPageSize());
-							// searchForStream to work correctly (#3098) as there the page size defines what is
+							}
-							// returned in a single request, and the max result determines the total number of
-							// documents returned
-							var size = query.isLimiting() ? Math.min(pageSize, query.getMaxResults()) : pageSize;
-							bb.from((int) offset).size(size);
 
 							if (!isEmpty(query.getFields())) {
 								bb.fields(fb -> {
@@ -1317,6 +1310,10 @@ class RequestConverter extends AbstractQueryProcessor {
 								bb.storedFields(query.getStoredFields());
 							}
 
+							if (query.isLimiting()) {
+								bb.size(query.getMaxResults());
+							}
+
 							if (query.getMinScore() > 0) {
 								bb.minScore((double) query.getMinScore());
 							}
@@ -1351,9 +1348,7 @@ class RequestConverter extends AbstractQueryProcessor {
 
 										if (script != null) {
 											rfb.script(s -> {
-												if (script != null) {
+												s.source(script);
-													s.source(so -> so.scriptString(script));
-												}
 
 												if (runtimeField.getParams() != null) {
 													s.params(TypeUtils.paramsMap(runtimeField.getParams()));
@@ -1370,14 +1365,9 @@ class RequestConverter extends AbstractQueryProcessor {
 							}
 
 							if (!isEmpty(query.getIndicesBoost())) {
-								Stream<NamedValue<Double>> namedValueStream = query.getIndicesBoost().stream()
+								bb.indicesBoost(query.getIndicesBoost().stream()
-										.map(indexBoost -> {
+										.map(indexBoost -> Map.of(indexBoost.getIndexName(), (double) indexBoost.getBoost()))
-											var namedValue = new NamedValue(indexBoost.getIndexName(),
+										.collect(Collectors.toList()));
-													Float.valueOf(indexBoost.getBoost()).doubleValue());
-											return namedValue;
-										});
-								List<NamedValue<Double>> namedValueList = namedValueStream.collect(Collectors.toList());
-								bb.indicesBoost(namedValueList);
 							}
 
 							query.getScriptedFields().forEach(scriptedField -> bb.scriptFields(scriptedField.getFieldName(),
@@ -1476,14 +1466,13 @@ class RequestConverter extends AbstractQueryProcessor {
 			builder.seqNoPrimaryTerm(true);
 		}
 
-		var offset = query.getPageable().isPaged() ? query.getPageable().getOffset() : 0;
+		if (query.getPageable().isPaged()) {
-		var pageSize = query.getPageable().isPaged() ? query.getPageable().getPageSize() : INDEX_MAX_RESULT_WINDOW;
+			builder //
-		// if we have both a page size and a max results, we take the min, this is necessary for
+					.from((int) query.getPageable().getOffset()) //
-		// searchForStream to work correctly (#3098) as there the page size defines what is
+					.size(query.getPageable().getPageSize());
-		// returned in a single request, and the max result determines the total number of
+		} else {
-		// documents returned
+			builder.from(0).size(INDEX_MAX_RESULT_WINDOW);
-		var size = query.isLimiting() ? Math.min(pageSize, query.getMaxResults()) : pageSize;
+		}
-		builder.from((int) offset).size(size);
 
 		if (!isEmpty(query.getFields())) {
 			var fieldAndFormats = query.getFields().stream().map(field -> FieldAndFormat.of(b -> b.field(field))).toList();
@@ -1498,6 +1487,10 @@ class RequestConverter extends AbstractQueryProcessor {
 			addIndicesOptions(builder, query.getIndicesOptions());
 		}
 
+		if (query.isLimiting()) {
+			builder.size(query.getMaxResults());
+		}
+
 		if (query.getMinScore() > 0) {
 			builder.minScore((double) query.getMinScore());
 		}
@@ -1555,9 +1548,7 @@ class RequestConverter extends AbstractQueryProcessor {
 						String script = runtimeField.getScript();
 						if (script != null) {
 							rfb.script(s -> {
-								if (script != null) {
+								s.source(script);
-									s.source(so -> so.scriptString(script));
-								}
 
 								if (runtimeField.getParams() != null) {
 									s.params(TypeUtils.paramsMap(runtimeField.getParams()));
@@ -1585,14 +1576,9 @@ class RequestConverter extends AbstractQueryProcessor {
 		}
 
 		if (!isEmpty(query.getIndicesBoost())) {
-			Stream<NamedValue<Double>> namedValueStream = query.getIndicesBoost().stream()
+			builder.indicesBoost(query.getIndicesBoost().stream()
-					.map(indexBoost -> {
+					.map(indexBoost -> Map.of(indexBoost.getIndexName(), (double) indexBoost.getBoost()))
-						var namedValue = new NamedValue(indexBoost.getIndexName(),
+					.collect(Collectors.toList()));
-								Float.valueOf(indexBoost.getBoost()).doubleValue());
-						return namedValue;
-					});
-			List<NamedValue<Double>> namedValueList = namedValueStream.collect(Collectors.toList());
-			builder.indicesBoost(namedValueList);
 		}
 
 		if (!isEmpty(query.getDocValueFields())) {
@@ -1654,7 +1640,7 @@ class RequestConverter extends AbstractQueryProcessor {
 		builder.highlight(highlight);
 	}
 
-	private void addHighlight(Query query, SearchRequestBody.Builder builder) {
+	private void addHighlight(Query query, MultisearchBody.Builder builder) {
 
 		Highlight highlight = query.getHighlightQuery()
 				.map(highlightQuery -> new HighlightQueryBuilder(elasticsearchConverter.getMappingContext(), this)
@@ -1734,7 +1720,7 @@ class RequestConverter extends AbstractQueryProcessor {
 	}
 
 	@Nullable
-	private NestedSortValue getNestedSort(Order.@Nullable Nested nested,
+	private NestedSortValue getNestedSort(@Nullable Order.Nested nested,
 			@Nullable ElasticsearchPersistentEntity<?> persistentEntity) {
 		return (nested == null || persistentEntity == null) ? null
 				: NestedSortValue.of(b -> b //
@@ -1778,7 +1764,7 @@ class RequestConverter extends AbstractQueryProcessor {
 	}
 
 	@SuppressWarnings("DuplicatedCode")
-	private void prepareNativeSearch(NativeQuery query, SearchRequestBody.Builder builder) {
+	private void prepareNativeSearch(NativeQuery query, MultisearchBody.Builder builder) {
 
 		builder //
 				.suggest(query.getSuggester()) //
@@ -1798,7 +1784,8 @@ class RequestConverter extends AbstractQueryProcessor {
 		}
 	}
 
-	co.elastic.clients.elasticsearch._types.query_dsl.@Nullable Query getQuery(@Nullable Query query,
+	@Nullable
+	co.elastic.clients.elasticsearch._types.query_dsl.Query getQuery(@Nullable Query query,
 			@Nullable Class<?> clazz) {
 		return getEsQuery(query, (q) -> elasticsearchConverter.updateQuery(q, clazz));
 	}
@@ -1897,11 +1884,10 @@ class RequestConverter extends AbstractQueryProcessor {
 					.id(query.getId()) //
 					.index(Arrays.asList(index.getIndexNames())) //
 					.preference(query.getPreference()) //
-					.searchType(searchType(query.getSearchType())); //
+					.searchType(searchType(query.getSearchType())) //
+					.source(query.getSource()) //
+			;
 
-			if (query.getSource() != null) {
-				builder.source(so -> so.scriptString(query.getSource()));
-			}
 			if (query.getRoute() != null) {
 				builder.routing(query.getRoute());
 			} else if (StringUtils.hasText(routing)) {
@@ -1944,7 +1930,7 @@ class RequestConverter extends AbstractQueryProcessor {
 				.id(script.id()) //
 				.script(sb -> sb //
 						.lang(script.language()) //
-					.source(s -> s.scriptString(script.source()))));
+						.source(script.source())));
 	}
 
 	public GetScriptRequest scriptGet(String name) {

src/main/java/org/springframework/data/elasticsearch/client/elc/ResponseConverter.java

@@ -48,7 +48,6 @@ import java.util.stream.Collectors;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.ElasticsearchErrorCause;
 import org.springframework.data.elasticsearch.core.IndexInformation;
 import org.springframework.data.elasticsearch.core.MultiGetItem;
@@ -66,6 +65,7 @@ import org.springframework.data.elasticsearch.core.reindex.ReindexResponse;
 import org.springframework.data.elasticsearch.core.script.Script;
 import org.springframework.data.elasticsearch.core.sql.SqlResponse;
 import org.springframework.data.elasticsearch.support.DefaultStringObjectMap;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**
@@ -92,7 +92,7 @@ class ResponseConverter {
 		return ClusterHealth.builder() //
 				.withActivePrimaryShards(healthResponse.activePrimaryShards()) //
 				.withActiveShards(healthResponse.activeShards()) //
-				.withActiveShardsPercent(healthResponse.activeShardsPercentAsNumber())//
+				.withActiveShardsPercent(Double.parseDouble(healthResponse.activeShardsPercentAsNumber()))//
 				.withClusterName(healthResponse.clusterName()) //
 				.withDelayedUnassignedShards(healthResponse.delayedUnassignedShards()) //
 				.withInitializingShards(healthResponse.initializingShards()) //
@@ -191,7 +191,7 @@ class ResponseConverter {
 		Assert.notNull(getMappingResponse, "getMappingResponse must not be null");
 		Assert.notNull(indexCoordinates, "indexCoordinates must not be null");
 
-		Map<String, IndexMappingRecord> mappings = getMappingResponse.mappings();
+		Map<String, IndexMappingRecord> mappings = getMappingResponse.result();
 
 		if (mappings == null || mappings.isEmpty()) {
 			return Document.create();
@@ -219,7 +219,7 @@ class ResponseConverter {
 
 		List<IndexInformation> indexInformationList = new ArrayList<>();
 
-		getIndexResponse.indices().forEach((indexName, indexState) -> {
+		getIndexResponse.result().forEach((indexName, indexState) -> {
 			Settings settings = indexState.settings() != null ? Settings.parse(toJson(indexState.settings(), jsonpMapper))
 					: new Settings();
 			Document mappings = indexState.mappings() != null ? Document.parse(toJson(indexState.mappings(), jsonpMapper))
@@ -239,7 +239,7 @@ class ResponseConverter {
 		Assert.notNull(getAliasResponse, "getAliasResponse must not be null");
 
 		Map<String, Set<AliasData>> aliasDataMap = new HashMap<>();
-		getAliasResponse.aliases().forEach((indexName, alias) -> {
+		getAliasResponse.result().forEach((indexName, alias) -> {
 			Set<AliasData> aliasDataSet = new HashSet<>();
 			alias.aliases()
 					.forEach((aliasName, aliasDefinition) -> aliasDataSet.add(indicesGetAliasData(aliasName, aliasDefinition)));
@@ -400,6 +400,7 @@ class ResponseConverter {
 	private ReindexResponse.Failure reindexResponseFailureOf(BulkIndexByScrollFailure failure) {
 		return ReindexResponse.Failure.builder() //
 				.withIndex(failure.index()) //
+				.withType(failure.type()) //
 				.withId(failure.id()) //
 				.withStatus(failure.status())//
 				.withErrorCause(toErrorCause(failure.cause())) //
@@ -410,12 +411,14 @@ class ResponseConverter {
 	private ByQueryResponse.Failure byQueryResponseFailureOf(BulkIndexByScrollFailure failure) {
 		return ByQueryResponse.Failure.builder() //
 				.withIndex(failure.index()) //
+				.withType(failure.type()) //
 				.withId(failure.id()) //
 				.withStatus(failure.status())//
 				.withErrorCause(toErrorCause(failure.cause())).build();
 	}
 
-	public static MultiGetItem.@Nullable Failure getFailure(MultiGetResponseItem<EntityAsMap> itemResponse) {
+	@Nullable
+	public static MultiGetItem.Failure getFailure(MultiGetResponseItem<EntityAsMap> itemResponse) {
 
 		MultiGetError responseFailure = itemResponse.isFailure() ? itemResponse.failure() : null;
 
@@ -497,10 +500,6 @@ class ResponseConverter {
 			builder.withDeleted(response.deleted());
 		}
 
-		if(response.updated() != null) {
-			builder.withUpdated(response.updated());
-		}
-
 		if (response.batches() != null) {
 			builder.withBatches(Math.toIntExact(response.batches()));
 		}
@@ -535,7 +534,7 @@ class ResponseConverter {
 				? Script.builder() //
 						.withId(response.id()) //
 						.withLanguage(response.script().lang()) //
-						.withSource(response.script().source().scriptString()).build() //
+						.withSource(response.script().source()).build() //
 				: null;
 	}
 	// endregion

src/main/java/org/springframework/data/elasticsearch/client/elc/SearchDocumentResponseBuilder.java

@@ -39,7 +39,6 @@ import java.util.stream.Collectors;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.SearchShardStatistics;
 import org.springframework.data.elasticsearch.core.TotalHitsRelation;
 import org.springframework.data.elasticsearch.core.document.SearchDocument;
@@ -49,6 +48,7 @@ import org.springframework.data.elasticsearch.core.suggest.response.PhraseSugges
 import org.springframework.data.elasticsearch.core.suggest.response.Suggest;
 import org.springframework.data.elasticsearch.core.suggest.response.TermSuggestion;
 import org.springframework.data.elasticsearch.support.ScoreDoc;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.CollectionUtils;
 
@@ -133,8 +133,7 @@ class SearchDocumentResponseBuilder {
 	 * @return the {@link SearchDocumentResponse}
 	 */
 	public static <T> SearchDocumentResponse from(HitsMetadata<?> hitsMetadata, @Nullable ShardStatistics shards,
-			@Nullable String scrollId, @Nullable String pointInTimeId, long executionDurationInMillis,
+			@Nullable String scrollId, @Nullable String pointInTimeId, long executionDurationInMillis, @Nullable Map<String, Aggregate> aggregations,
-			@Nullable Map<String, Aggregate> aggregations,
 			Map<String, List<Suggestion<EntityAsMap>>> suggestES, SearchDocumentResponse.EntityCreator<T> entityCreator,
 			JsonpMapper jsonpMapper) {
 
@@ -172,8 +171,7 @@ class SearchDocumentResponseBuilder {
 
 		SearchShardStatistics shardStatistics = shards != null ? shardsFrom(shards) : null;
 
-		return new SearchDocumentResponse(totalHits, totalHitsRelation, maxScore, executionDuration, scrollId,
+		return new SearchDocumentResponse(totalHits, totalHitsRelation, maxScore, executionDuration, scrollId, pointInTimeId, searchDocuments,
-				pointInTimeId, searchDocuments,
 				aggregationsContainer, suggest, shardStatistics);
 	}
 

src/main/java/org/springframework/data/elasticsearch/client/elc/TypeUtils.java

@@ -38,7 +38,6 @@ import java.util.List;
 import java.util.Map;
 import java.util.stream.Collectors;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.domain.Sort;
 import org.springframework.data.elasticsearch.core.RefreshPolicy;
 import org.springframework.data.elasticsearch.core.document.Document;
@@ -53,6 +52,7 @@ import org.springframework.data.elasticsearch.core.query.UpdateResponse;
 import org.springframework.data.elasticsearch.core.query.types.ConflictsType;
 import org.springframework.data.elasticsearch.core.query.types.OperatorType;
 import org.springframework.data.elasticsearch.core.reindex.ReindexRequest;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**
@@ -220,7 +220,7 @@ final class TypeUtils {
 	}
 
 	@Nullable
-	static SortOrder sortOrder(Sort.@Nullable Direction direction) {
+	static SortOrder sortOrder(@Nullable Sort.Direction direction) {
 
 		if (direction == null) {
 			return null;
@@ -301,7 +301,7 @@ final class TypeUtils {
 	}
 
 	@Nullable
-	static OpType opType(IndexQuery.@Nullable OpType opType) {
+	static OpType opType(@Nullable IndexQuery.OpType opType) {
 
 		if (opType != null) {
 			return switch (opType) {
@@ -325,7 +325,8 @@ final class TypeUtils {
 		};
 	}
 
-	static UpdateResponse.@Nullable Result result(@Nullable Result result) {
+	@Nullable
+	static UpdateResponse.Result result(@Nullable Result result) {
 
 		if (result == null) {
 			return null;
@@ -342,7 +343,7 @@ final class TypeUtils {
 	}
 
 	@Nullable
-	static ScoreMode scoreMode(RescorerQuery.@Nullable ScoreMode scoreMode) {
+	static ScoreMode scoreMode(@Nullable RescorerQuery.ScoreMode scoreMode) {
 
 		if (scoreMode == null) {
 			return null;
@@ -360,7 +361,7 @@ final class TypeUtils {
 	}
 
 	@Nullable
-	static SearchType searchType(Query.@Nullable SearchType searchType) {
+	static SearchType searchType(@Nullable Query.SearchType searchType) {
 
 		if (searchType == null) {
 			return null;
@@ -417,7 +418,7 @@ final class TypeUtils {
 
 	@Nullable
 	static VersionType versionType(
-			org.springframework.data.elasticsearch.annotations.Document.@Nullable VersionType versionType) {
+			@Nullable org.springframework.data.elasticsearch.annotations.Document.VersionType versionType) {
 
 		if (versionType != null) {
 			return switch (versionType) {
@@ -535,7 +536,7 @@ final class TypeUtils {
 	 * @param scoreMode spring-data-elasticsearch {@literal scoreMode}.
 	 * @return an Elasticsearch {@literal scoreMode}.
 	 */
-	static ChildScoreMode scoreMode(HasChildQuery.@Nullable ScoreMode scoreMode) {
+	static ChildScoreMode scoreMode(@Nullable HasChildQuery.ScoreMode scoreMode) {
 		if (scoreMode == null) {
 			return ChildScoreMode.None;
 		}

src/main/java/org/springframework/data/elasticsearch/client/elc/aot/ElasticsearchClientRuntimeHints.java

@@ -19,11 +19,11 @@ import co.elastic.clients.elasticsearch._types.mapping.RuntimeFieldType;
 import co.elastic.clients.elasticsearch._types.mapping.TypeMapping;
 import co.elastic.clients.elasticsearch.indices.IndexSettings;
 import co.elastic.clients.elasticsearch.indices.PutMappingRequest;
-
+import org.springframework.aot.hint.MemberCategory;
-import org.jspecify.annotations.Nullable;
 import org.springframework.aot.hint.RuntimeHints;
 import org.springframework.aot.hint.RuntimeHintsRegistrar;
 import org.springframework.aot.hint.TypeReference;
+import org.springframework.lang.Nullable;
 
 /**
  * runtime hints for the Elasticsearch client libraries, as these do not provide any of their own.

src/main/java/org/springframework/data/elasticsearch/client/elc/aot/package-info.java

@@ -1,2 +1,3 @@
-@org.jspecify.annotations.NullMarked
+@org.springframework.lang.NonNullApi
+@org.springframework.lang.NonNullFields
 package org.springframework.data.elasticsearch.client.elc.aot;

src/main/java/org/springframework/data/elasticsearch/client/elc/package-info.java

@@ -18,5 +18,6 @@
  * This package contains classes that use the new Elasticsearch client library (co.elastic.clients:elasticsearch-java)
  * to access Elasticsearch.
  */
-@org.jspecify.annotations.NullMarked
+@org.springframework.lang.NonNullApi
+@org.springframework.lang.NonNullFields
 package org.springframework.data.elasticsearch.client.elc;

src/main/java/org/springframework/data/elasticsearch/client/elc/rest5_client/Rest5Clients.java

@@ -1,274 +0,0 @@
-package org.springframework.data.elasticsearch.client.elc.rest5_client;
-
-import co.elastic.clients.transport.TransportOptions;
-import co.elastic.clients.transport.TransportUtils;
-import co.elastic.clients.transport.rest5_client.Rest5ClientOptions;
-import co.elastic.clients.transport.rest5_client.low_level.RequestOptions;
-import co.elastic.clients.transport.rest5_client.low_level.Rest5Client;
-import co.elastic.clients.transport.rest5_client.low_level.Rest5ClientBuilder;
-
-import java.net.InetSocketAddress;
-import java.net.URI;
-import java.net.URISyntaxException;
-import java.security.NoSuchAlgorithmException;
-import java.time.Duration;
-import java.util.List;
-import java.util.Locale;
-import java.util.concurrent.ThreadFactory;
-import java.util.concurrent.TimeUnit;
-import java.util.concurrent.atomic.AtomicLong;
-import java.util.function.Function;
-
-import javax.net.ssl.SSLContext;
-
-import org.apache.hc.client5.http.config.ConnectionConfig;
-import org.apache.hc.client5.http.config.RequestConfig;
-import org.apache.hc.client5.http.impl.DefaultAuthenticationStrategy;
-import org.apache.hc.client5.http.impl.async.CloseableHttpAsyncClient;
-import org.apache.hc.client5.http.impl.async.HttpAsyncClientBuilder;
-import org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManager;
-import org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManagerBuilder;
-import org.apache.hc.client5.http.impl.routing.DefaultProxyRoutePlanner;
-import org.apache.hc.core5.http.Header;
-import org.apache.hc.core5.http.HttpHost;
-import org.apache.hc.core5.http.message.BasicHeader;
-import org.apache.hc.core5.http.nio.ssl.BasicClientTlsStrategy;
-import org.apache.hc.core5.util.Timeout;
-import org.jspecify.annotations.NonNull;
-import org.jspecify.annotations.Nullable;
-import org.springframework.data.elasticsearch.client.ClientConfiguration;
-import org.springframework.data.elasticsearch.support.HttpHeaders;
-import org.springframework.data.elasticsearch.support.VersionInfo;
-import org.springframework.util.Assert;
-
-/**
- * Utility class containing the functions to create the Elasticsearch Rest5Client used from Elasticsearch 9 on.
- *
- * @since 6.0
- */
-public final class Rest5Clients {
-
-	// values copied from Rest5ClientBuilder
-	public static final int DEFAULT_CONNECT_TIMEOUT_MILLIS = 1000;
-	public static final int DEFAULT_SOCKET_TIMEOUT_MILLIS = 30000;
-	public static final int DEFAULT_RESPONSE_TIMEOUT_MILLIS = 0; // meaning infinite
-	public static final int DEFAULT_MAX_CONN_PER_ROUTE = 10;
-	public static final int DEFAULT_MAX_CONN_TOTAL = 30;
-
-	private Rest5Clients() {}
-
-	/**
-	 * Creates a low level {@link Rest5Client} for the given configuration.
-	 *
-	 * @param clientConfiguration must not be {@literal null}
-	 * @return the {@link Rest5Client}
-	 */
-	public static Rest5Client getRest5Client(ClientConfiguration clientConfiguration) {
-		return getRest5ClientBuilder(clientConfiguration).build();
-	}
-
-	private static Rest5ClientBuilder getRest5ClientBuilder(ClientConfiguration clientConfiguration) {
-
-		HttpHost[] httpHosts = getHttpHosts(clientConfiguration);
-		Rest5ClientBuilder builder = Rest5Client.builder(httpHosts);
-
-		if (clientConfiguration.getPathPrefix() != null) {
-			builder.setPathPrefix(clientConfiguration.getPathPrefix());
-		}
-
-		HttpHeaders headers = clientConfiguration.getDefaultHeaders();
-
-		if (!headers.isEmpty()) {
-			builder.setDefaultHeaders(toHeaderArray(headers));
-		}
-
-		// we need to provide our own HttpClient, as the Rest5ClientBuilder
-		// does not provide a callback for configuration the http client as the old RestClientBuilder.
-		var httpClient = createHttpClient(clientConfiguration);
-		builder.setHttpClient(httpClient);
-
-		for (ClientConfiguration.ClientConfigurationCallback<?> clientConfigurationCallback : clientConfiguration
-				.getClientConfigurers()) {
-			if (clientConfigurationCallback instanceof ElasticsearchRest5ClientConfigurationCallback configurationCallback) {
-				builder = configurationCallback.configure(builder);
-			}
-		}
-
-		return builder;
-	}
-
-	private static HttpHost @NonNull [] getHttpHosts(ClientConfiguration clientConfiguration) {
-		List<InetSocketAddress> hosts = clientConfiguration.getEndpoints();
-		boolean useSsl = clientConfiguration.useSsl();
-		return hosts.stream()
-				.map(it -> (useSsl ? "https" : "http") + "://" + it.getHostString() + ':' + it.getPort())
-				.map(URI::create)
-				.map(HttpHost::create)
-				.toArray(HttpHost[]::new);
-	}
-
-	private static Header[] toHeaderArray(HttpHeaders headers) {
-		return headers.entrySet().stream() //
-				.flatMap(entry -> entry.getValue().stream() //
-						.map(value -> new BasicHeader(entry.getKey(), value))) //
-				.toList().toArray(new Header[0]);
-	}
-
-	// the basic logic to create the http client is copied from the Rest5ClientBuilder class, this is taken from the
-	// Elasticsearch code, as there is no public usable instance in that
-	private static CloseableHttpAsyncClient createHttpClient(ClientConfiguration clientConfiguration) {
-
-		var requestConfigBuilder = RequestConfig.custom();
-		var connectionConfigBuilder = ConnectionConfig.custom();
-
-		Duration connectTimeout = clientConfiguration.getConnectTimeout();
-
-		if (!connectTimeout.isNegative()) {
-			connectionConfigBuilder.setConnectTimeout(
-					Timeout.of(Math.toIntExact(connectTimeout.toMillis()), TimeUnit.MILLISECONDS));
-		}
-
-		Duration socketTimeout = clientConfiguration.getSocketTimeout();
-
-		if (!socketTimeout.isNegative()) {
-			var soTimeout = Timeout.of(Math.toIntExact(socketTimeout.toMillis()), TimeUnit.MILLISECONDS);
-			connectionConfigBuilder.setSocketTimeout(soTimeout);
-			requestConfigBuilder.setConnectionRequestTimeout(soTimeout);
-		} else {
-			connectionConfigBuilder.setSocketTimeout(Timeout.of(DEFAULT_SOCKET_TIMEOUT_MILLIS, TimeUnit.MILLISECONDS));
-			requestConfigBuilder
-					.setConnectionRequestTimeout(Timeout.of(DEFAULT_RESPONSE_TIMEOUT_MILLIS, TimeUnit.MILLISECONDS));
-		}
-
-		try {
-			SSLContext sslContext = clientConfiguration.getCaFingerprint().isPresent()
-					? TransportUtils.sslContextFromCaFingerprint(clientConfiguration.getCaFingerprint().get())
-					: (clientConfiguration.getSslContext().isPresent()
-							? clientConfiguration.getSslContext().get()
-							: SSLContext.getDefault());
-
-			ConnectionConfig connectionConfig = connectionConfigBuilder.build();
-
-			PoolingAsyncClientConnectionManager defaultConnectionManager = PoolingAsyncClientConnectionManagerBuilder.create()
-					.setDefaultConnectionConfig(connectionConfig)
-					.setMaxConnPerRoute(DEFAULT_MAX_CONN_PER_ROUTE)
-					.setMaxConnTotal(DEFAULT_MAX_CONN_TOTAL)
-					.setTlsStrategy(new BasicClientTlsStrategy(sslContext))
-					.build();
-
-			var requestConfig = requestConfigBuilder.build();
-
-            var immutableRefToHttpClientBuilder = new Object() {
-                HttpAsyncClientBuilder httpClientBuilder = HttpAsyncClientBuilder.create()
-                        .setDefaultRequestConfig(requestConfig)
-                        .setConnectionManager(defaultConnectionManager)
-                        .setUserAgent(VersionInfo.clientVersions())
-                        .setTargetAuthenticationStrategy(new DefaultAuthenticationStrategy())
-                        .setThreadFactory(new RestClientThreadFactory());
-            };
-
-			clientConfiguration.getProxy().ifPresent(proxy -> {
-				try {
-					var proxyRoutePlanner = new DefaultProxyRoutePlanner(HttpHost.create(proxy));
-					immutableRefToHttpClientBuilder.httpClientBuilder.setRoutePlanner(proxyRoutePlanner);
-				} catch (URISyntaxException e) {
-					throw new RuntimeException(e);
-				}
-			});
-
-			immutableRefToHttpClientBuilder.httpClientBuilder.addRequestInterceptorFirst((request, entity, context) -> {
-				clientConfiguration.getHeadersSupplier().get().forEach((header, values) -> {
-					// The accept and content-type headers are already put on the request, despite this being the first
-					// interceptor.
-					if ("Accept".equalsIgnoreCase(header) || " Content-Type".equalsIgnoreCase(header)) {
-						request.removeHeaders(header);
-					}
-					values.forEach(value -> request.addHeader(header, value));
-				});
-			});
-
-			for (ClientConfiguration.ClientConfigurationCallback<?> clientConfigurer : clientConfiguration
-					.getClientConfigurers()) {
-				if (clientConfigurer instanceof ElasticsearchHttpClientConfigurationCallback httpClientConfigurer) {
-					immutableRefToHttpClientBuilder.httpClientBuilder = httpClientConfigurer.configure(immutableRefToHttpClientBuilder.httpClientBuilder);
-				}
-			}
-
-			return immutableRefToHttpClientBuilder.httpClientBuilder.build();
-		} catch (NoSuchAlgorithmException e) {
-			throw new IllegalStateException("could not create the default ssl context", e);
-		}
-	}
-
-	/*
-	 * Copied from the Elasticsearch code as this class is not public there.
-	 */
-	private static class RestClientThreadFactory implements ThreadFactory {
-		private static final AtomicLong CLIENT_THREAD_POOL_ID_GENERATOR = new AtomicLong();
-		private final long clientThreadPoolId;
-		private final AtomicLong clientThreadId;
-
-		private RestClientThreadFactory() {
-			this.clientThreadPoolId = CLIENT_THREAD_POOL_ID_GENERATOR.getAndIncrement();
-			this.clientThreadId = new AtomicLong();
-		}
-
-		public Thread newThread(Runnable runnable) {
-			return new Thread(runnable, String.format(Locale.ROOT, "elasticsearch-rest-client-%d-thread-%d",
-					this.clientThreadPoolId, this.clientThreadId.incrementAndGet()));
-		}
-	}
-
-	/**
-	 * {@link org.springframework.data.elasticsearch.client.ClientConfiguration.ClientConfigurationCallback} to configure
-	 * the Elasticsearch Rest5Client's Http client with a {@link HttpAsyncClientBuilder}
-	 *
-	 * @since 6.0
-	 */
-	public interface ElasticsearchHttpClientConfigurationCallback
-			extends ClientConfiguration.ClientConfigurationCallback<HttpAsyncClientBuilder> {
-
-		static Rest5Clients.ElasticsearchHttpClientConfigurationCallback from(
-				Function<HttpAsyncClientBuilder, HttpAsyncClientBuilder> httpClientBuilderCallback) {
-
-			Assert.notNull(httpClientBuilderCallback, "httpClientBuilderCallback must not be null");
-
-			return httpClientBuilderCallback::apply;
-		}
-	}
-
-	/**
-	 * {@link ClientConfiguration.ClientConfigurationCallback} to configure the Rest5Client client with a
-	 * {@link Rest5ClientBuilder}
-	 *
-	 * @since 6.0
-	 */
-	public interface ElasticsearchRest5ClientConfigurationCallback
-			extends ClientConfiguration.ClientConfigurationCallback<Rest5ClientBuilder> {
-
-		static ElasticsearchRest5ClientConfigurationCallback from(
-				Function<Rest5ClientBuilder, Rest5ClientBuilder> rest5ClientBuilderCallback) {
-
-			Assert.notNull(rest5ClientBuilderCallback, "rest5ClientBuilderCallback must not be null");
-
-			return rest5ClientBuilderCallback::apply;
-		}
-	}
-
-	public static Rest5ClientOptions.Builder getRest5ClientOptionsBuilder(@Nullable TransportOptions transportOptions) {
-
-		if (transportOptions instanceof Rest5ClientOptions rest5ClientOptions) {
-			return rest5ClientOptions.toBuilder();
-		}
-
-		var builder = new Rest5ClientOptions.Builder(RequestOptions.DEFAULT.toBuilder());
-
-		if (transportOptions != null) {
-			transportOptions.headers().forEach(header -> builder.addHeader(header.getKey(), header.getValue()));
-			transportOptions.queryParameters().forEach(builder::setParameter);
-			builder.onWarnings(transportOptions.onWarnings());
-		}
-
-		return builder;
-	}
-}

src/main/java/org/springframework/data/elasticsearch/client/elc/rest5_client/package-info.java

@@ -1,21 +0,0 @@
-/*
- * Copyright 2025 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-/**
- * This package contains related to the new (from Elasticsearch 9 on) Rest5Client. There are also classes copied over from Elasticsearch in order to have a Rest5ClientBuilder that allows to configure the http client.
- */
-@org.jspecify.annotations.NullMarked
-package org.springframework.data.elasticsearch.client.elc.rest5_client;

src/main/java/org/springframework/data/elasticsearch/client/elc/rest_client/RestClients.java

@@ -1,195 +0,0 @@
-package org.springframework.data.elasticsearch.client.elc.rest_client;
-
-import co.elastic.clients.transport.TransportOptions;
-import co.elastic.clients.transport.TransportUtils;
-import co.elastic.clients.transport.rest_client.RestClientOptions;
-
-import java.net.InetSocketAddress;
-import java.time.Duration;
-import java.util.Arrays;
-import java.util.List;
-import java.util.function.Function;
-import java.util.function.Supplier;
-
-import org.apache.http.HttpHost;
-import org.apache.http.HttpRequest;
-import org.apache.http.HttpRequestInterceptor;
-import org.apache.http.client.config.RequestConfig;
-import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
-import org.apache.http.message.BasicHeader;
-import org.apache.http.protocol.HttpContext;
-import org.elasticsearch.client.RequestOptions;
-import org.elasticsearch.client.RestClient;
-import org.elasticsearch.client.RestClientBuilder;
-import org.jspecify.annotations.NonNull;
-import org.jspecify.annotations.Nullable;
-import org.springframework.data.elasticsearch.client.ClientConfiguration;
-import org.springframework.data.elasticsearch.client.elc.ElasticsearchClients;
-import org.springframework.data.elasticsearch.support.HttpHeaders;
-import org.springframework.util.Assert;
-
-/**
- * Utility class containing the functions to create the Elasticsearch RestClient used up to Elasticsearch 9.
- *
- * @since 6.0
- * @deprecated since 6.0, use the new Rest5Client the code for that is in the package ../rest_client.
- */
-@Deprecated(since = "6.0", forRemoval = true)
-public final class RestClients {
-
-	/**
-	 * Creates a low level {@link RestClient} for the given configuration.
-	 *
-	 * @param clientConfiguration must not be {@literal null}
-	 * @return the {@link RestClient}
-	 */
-	public static RestClient getRestClient(ClientConfiguration clientConfiguration) {
-		return getRestClientBuilder(clientConfiguration).build();
-	}
-
-	private static RestClientBuilder getRestClientBuilder(ClientConfiguration clientConfiguration) {
-		HttpHost[] httpHosts = getHttpHosts(clientConfiguration);
-		RestClientBuilder builder = RestClient.builder(httpHosts);
-
-		if (clientConfiguration.getPathPrefix() != null) {
-			builder.setPathPrefix(clientConfiguration.getPathPrefix());
-		}
-
-		HttpHeaders headers = clientConfiguration.getDefaultHeaders();
-
-		if (!headers.isEmpty()) {
-			builder.setDefaultHeaders(toHeaderArray(headers));
-		}
-
-		builder.setHttpClientConfigCallback(clientBuilder -> {
-			if (clientConfiguration.getCaFingerprint().isPresent()) {
-				clientBuilder
-						.setSSLContext(TransportUtils.sslContextFromCaFingerprint(clientConfiguration.getCaFingerprint().get()));
-			}
-			clientConfiguration.getSslContext().ifPresent(clientBuilder::setSSLContext);
-			clientConfiguration.getHostNameVerifier().ifPresent(clientBuilder::setSSLHostnameVerifier);
-			clientBuilder.addInterceptorLast(new CustomHeaderInjector(clientConfiguration.getHeadersSupplier()));
-
-			RequestConfig.Builder requestConfigBuilder = RequestConfig.custom();
-			Duration connectTimeout = clientConfiguration.getConnectTimeout();
-
-			if (!connectTimeout.isNegative()) {
-				requestConfigBuilder.setConnectTimeout(Math.toIntExact(connectTimeout.toMillis()));
-			}
-
-			Duration socketTimeout = clientConfiguration.getSocketTimeout();
-
-			if (!socketTimeout.isNegative()) {
-				requestConfigBuilder.setSocketTimeout(Math.toIntExact(socketTimeout.toMillis()));
-				requestConfigBuilder.setConnectionRequestTimeout(Math.toIntExact(socketTimeout.toMillis()));
-			}
-
-			clientBuilder.setDefaultRequestConfig(requestConfigBuilder.build());
-
-			clientConfiguration.getProxy().map(HttpHost::create).ifPresent(clientBuilder::setProxy);
-
-			for (ClientConfiguration.ClientConfigurationCallback<?> clientConfigurer : clientConfiguration
-					.getClientConfigurers()) {
-				if (clientConfigurer instanceof RestClients.ElasticsearchHttpClientConfigurationCallback restClientConfigurationCallback) {
-					clientBuilder = restClientConfigurationCallback.configure(clientBuilder);
-				}
-			}
-
-			return clientBuilder;
-		});
-
-		for (ClientConfiguration.ClientConfigurationCallback<?> clientConfigurationCallback : clientConfiguration
-				.getClientConfigurers()) {
-			if (clientConfigurationCallback instanceof ElasticsearchRestClientConfigurationCallback configurationCallback) {
-				builder = configurationCallback.configure(builder);
-			}
-		}
-		return builder;
-	}
-
-	private static HttpHost @NonNull [] getHttpHosts(ClientConfiguration clientConfiguration) {
-		List<InetSocketAddress> hosts = clientConfiguration.getEndpoints();
-		boolean useSsl = clientConfiguration.useSsl();
-		return hosts.stream()
-				.map(it -> (useSsl ? "https" : "http") + "://" + it.getHostString() + ':' + it.getPort())
-				.map(HttpHost::create).toArray(HttpHost[]::new);
-	}
-
-	private static org.apache.http.Header[] toHeaderArray(HttpHeaders headers) {
-		return headers.entrySet().stream() //
-				.flatMap(entry -> entry.getValue().stream() //
-						.map(value -> new BasicHeader(entry.getKey(), value))) //
-				.toArray(org.apache.http.Header[]::new);
-	}
-
-	/**
-	 * Interceptor to inject custom supplied headers.
-	 *
-	 * @since 4.4
-	 */
-	record CustomHeaderInjector(Supplier<HttpHeaders> headersSupplier) implements HttpRequestInterceptor {
-
-		@Override
-		public void process(HttpRequest request, HttpContext context) {
-			HttpHeaders httpHeaders = headersSupplier.get();
-
-			if (httpHeaders != null && !httpHeaders.isEmpty()) {
-				Arrays.stream(toHeaderArray(httpHeaders)).forEach(request::addHeader);
-			}
-		}
-	}
-
-	/**
-	 * {@link org.springframework.data.elasticsearch.client.ClientConfiguration.ClientConfigurationCallback} to configure
-	 * the Elasticsearch RestClient's Http client with a {@link HttpAsyncClientBuilder}
-	 *
-	 * @since 4.4
-	 */
-	public interface ElasticsearchHttpClientConfigurationCallback
-			extends ClientConfiguration.ClientConfigurationCallback<HttpAsyncClientBuilder> {
-
-		static RestClients.ElasticsearchHttpClientConfigurationCallback from(
-				Function<HttpAsyncClientBuilder, HttpAsyncClientBuilder> httpClientBuilderCallback) {
-
-			Assert.notNull(httpClientBuilderCallback, "httpClientBuilderCallback must not be null");
-
-			return httpClientBuilderCallback::apply;
-		}
-	}
-
-	/**
-	 * {@link org.springframework.data.elasticsearch.client.ClientConfiguration.ClientConfigurationCallback} to configure
-	 * the RestClient client with a {@link RestClientBuilder}
-	 *
-	 * @since 5.0
-	 */
-	public interface ElasticsearchRestClientConfigurationCallback
-			extends ClientConfiguration.ClientConfigurationCallback<RestClientBuilder> {
-
-		static ElasticsearchRestClientConfigurationCallback from(
-				Function<RestClientBuilder, RestClientBuilder> restClientBuilderCallback) {
-
-			Assert.notNull(restClientBuilderCallback, "restClientBuilderCallback must not be null");
-
-			return restClientBuilderCallback::apply;
-		}
-	}
-
-	public static RestClientOptions.Builder getRestClientOptionsBuilder(@Nullable TransportOptions transportOptions) {
-
-		if (transportOptions instanceof RestClientOptions restClientOptions) {
-			return restClientOptions.toBuilder();
-		}
-
-		var builder = new RestClientOptions.Builder(RequestOptions.DEFAULT.toBuilder());
-
-		if (transportOptions != null) {
-			transportOptions.headers().forEach(header -> builder.addHeader(header.getKey(), header.getValue()));
-			transportOptions.queryParameters().forEach(builder::setParameter);
-			builder.onWarnings(transportOptions.onWarnings());
-		}
-
-		return builder;
-	}
-
-}

src/main/java/org/springframework/data/elasticsearch/client/package-info.java

@@ -1,2 +1,3 @@
-@org.jspecify.annotations.NullMarked
+@org.springframework.lang.NonNullApi
+@org.springframework.lang.NonNullFields
 package org.springframework.data.elasticsearch.client;

src/main/java/org/springframework/data/elasticsearch/client/util/ScrollState.java

@@ -19,7 +19,7 @@ import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Set;
 
-import org.jspecify.annotations.Nullable;
+import org.springframework.lang.Nullable;
 import org.springframework.util.StringUtils;
 
 /**

src/main/java/org/springframework/data/elasticsearch/client/util/package-info.java

@@ -1,2 +1,3 @@
-@org.jspecify.annotations.NullMarked
+@org.springframework.lang.NonNullApi
+@org.springframework.lang.NonNullFields
 package org.springframework.data.elasticsearch.client.util;

src/main/java/org/springframework/data/elasticsearch/config/ElasticsearchAuditingBeanDefinitionParser.java

@@ -17,7 +17,6 @@ package org.springframework.data.elasticsearch.config;
 
 import static org.springframework.data.config.ParsingUtils.*;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.beans.factory.support.AbstractBeanDefinition;
 import org.springframework.beans.factory.support.BeanDefinitionBuilder;
 import org.springframework.beans.factory.support.BeanDefinitionRegistry;
@@ -29,6 +28,7 @@ import org.springframework.data.auditing.config.IsNewAwareAuditingHandlerBeanDef
 import org.springframework.data.elasticsearch.core.event.AuditingEntityCallback;
 import org.springframework.data.elasticsearch.core.event.ReactiveAuditingEntityCallback;
 import org.springframework.data.elasticsearch.core.mapping.SimpleElasticsearchMappingContext;
+import org.springframework.lang.Nullable;
 import org.springframework.util.ClassUtils;
 import org.springframework.util.StringUtils;
 import org.w3c.dom.Element;

src/main/java/org/springframework/data/elasticsearch/config/ElasticsearchConfigurationSupport.java

@@ -20,7 +20,6 @@ import java.util.Collections;
 import java.util.HashSet;
 import java.util.Set;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.beans.factory.config.BeanDefinition;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider;
@@ -35,6 +34,7 @@ import org.springframework.data.elasticsearch.core.convert.MappingElasticsearchC
 import org.springframework.data.elasticsearch.core.mapping.SimpleElasticsearchMappingContext;
 import org.springframework.data.mapping.model.FieldNamingStrategy;
 import org.springframework.data.mapping.model.PropertyNameFieldNamingStrategy;
+import org.springframework.lang.Nullable;
 import org.springframework.util.ClassUtils;
 import org.springframework.util.StringUtils;
 

src/main/java/org/springframework/data/elasticsearch/config/package-info.java

@@ -1,2 +1,3 @@
-@org.jspecify.annotations.NullMarked
+@org.springframework.lang.NonNullApi
+@org.springframework.lang.NonNullFields
 package org.springframework.data.elasticsearch.config;

src/main/java/org/springframework/data/elasticsearch/core/AbstractElasticsearchTemplate.java

@@ -24,7 +24,6 @@ import java.util.Objects;
 import java.util.concurrent.CompletableFuture;
 import java.util.stream.Collectors;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.beans.BeansException;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.ApplicationContextAware;
@@ -58,6 +57,7 @@ import org.springframework.data.elasticsearch.support.VersionInfo;
 import org.springframework.data.mapping.callback.EntityCallbacks;
 import org.springframework.data.mapping.context.MappingContext;
 import org.springframework.data.util.Streamable;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.StringUtils;
 
@@ -298,6 +298,12 @@ public abstract class AbstractElasticsearchTemplate implements ElasticsearchOper
 		return this.delete(id, getIndexCoordinatesFor(entityType));
 	}
 
+	@Override
+	@Deprecated
+	public ByQueryResponse delete(Query query, Class<?> clazz) {
+		return delete(query, clazz, getIndexCoordinatesFor(clazz));
+	}
+
 	@Override
 	public String delete(Object entity) {
 		return delete(entity, getIndexCoordinatesFor(entity.getClass()));

src/main/java/org/springframework/data/elasticsearch/core/AbstractReactiveElasticsearchTemplate.java

@@ -26,7 +26,6 @@ import java.util.List;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.stream.Collectors;
 
-import org.jspecify.annotations.Nullable;
 import org.reactivestreams.Subscriber;
 import org.reactivestreams.Subscription;
 import org.springframework.beans.BeansException;
@@ -57,6 +56,7 @@ import org.springframework.data.elasticsearch.core.script.Script;
 import org.springframework.data.elasticsearch.core.suggest.response.Suggest;
 import org.springframework.data.elasticsearch.support.VersionInfo;
 import org.springframework.data.mapping.callback.ReactiveEntityCallbacks;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**
@@ -233,7 +233,6 @@ abstract public class AbstractReactiveElasticsearchTemplate
 					.subscribe(new Subscriber<>() {
 						@Nullable private Subscription subscription = null;
 						private final AtomicBoolean upstreamComplete = new AtomicBoolean(false);
-						private final AtomicBoolean onNextHasBeenCalled = new AtomicBoolean(false);
 
 						@Override
 						public void onSubscribe(Subscription subscription) {
@@ -243,7 +242,6 @@ abstract public class AbstractReactiveElasticsearchTemplate
 
 						@Override
 						public void onNext(List<T> entityList) {
-							onNextHasBeenCalled.set(true);
 							saveAll(entityList, index)
 									.map(sink::tryEmitNext)
 									.doOnComplete(() -> {
@@ -269,10 +267,6 @@ abstract public class AbstractReactiveElasticsearchTemplate
 						@Override
 						public void onComplete() {
 							upstreamComplete.set(true);
-							if (!onNextHasBeenCalled.get()) {
-								// this happens when an empty flux is saved
-								sink.tryEmitComplete();
-							}
 						}
 					});
 			return sink.asFlux();
@@ -414,6 +408,12 @@ abstract public class AbstractReactiveElasticsearchTemplate
 
 	abstract protected Mono<String> doDeleteById(String id, @Nullable String routing, IndexCoordinates index);
 
+	@Override
+	@Deprecated
+	public Mono<ByQueryResponse> delete(Query query, Class<?> entityType) {
+		return delete(query, entityType, getIndexCoordinatesFor(entityType));
+	}
+
 	@Override
 	public Mono<ByQueryResponse> delete(DeleteQuery query, Class<?> entityType) {
 		return delete(query, entityType, getIndexCoordinatesFor(entityType));

src/main/java/org/springframework/data/elasticsearch/core/DocumentOperations.java

@@ -18,7 +18,6 @@ package org.springframework.data.elasticsearch.core;
 import java.util.Collection;
 import java.util.List;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.mapping.IndexCoordinates;
 import org.springframework.data.elasticsearch.core.query.BulkOptions;
 import org.springframework.data.elasticsearch.core.query.ByQueryResponse;
@@ -29,6 +28,7 @@ import org.springframework.data.elasticsearch.core.query.UpdateQuery;
 import org.springframework.data.elasticsearch.core.query.UpdateResponse;
 import org.springframework.data.elasticsearch.core.reindex.ReindexRequest;
 import org.springframework.data.elasticsearch.core.reindex.ReindexResponse;
+import org.springframework.lang.Nullable;
 
 /**
  * The operations for the
@@ -272,6 +272,19 @@ public interface DocumentOperations {
 	 */
 	String delete(Object entity, IndexCoordinates index);
 
+	/**
+	 * Delete all records matching the query.
+	 *
+	 * @param query query defining the objects
+	 * @param clazz The entity class, must be annotated with
+	 *          {@link org.springframework.data.elasticsearch.annotations.Document}
+	 * @return response with detailed information
+	 * @since 4.1
+	 * @deprecated since 5.3.0, use {@link #delete(DeleteQuery, Class)}
+	 */
+	@Deprecated
+	ByQueryResponse delete(Query query, Class<?> clazz);
+
 	/**
 	 * Delete all records matching the query.
 	 *
@@ -283,6 +296,19 @@ public interface DocumentOperations {
 	 */
 	ByQueryResponse delete(DeleteQuery query, Class<?> clazz);
 
+	/**
+	 * Delete all records matching the query.
+	 *
+	 * @param query query defining the objects
+	 * @param clazz The entity class, must be annotated with
+	 *          {@link org.springframework.data.elasticsearch.annotations.Document}
+	 * @param index the index from which to delete
+	 * @return response with detailed information
+	 * @deprecated since 5.3.0, use {@link #delete(DeleteQuery, Class, IndexCoordinates)}
+	 */
+	@Deprecated
+	ByQueryResponse delete(Query query, Class<?> clazz, IndexCoordinates index);
+
 	/**
 	 * Delete all records matching the query.
 	 *

src/main/java/org/springframework/data/elasticsearch/core/ElasticsearchOperations.java

@@ -15,13 +15,13 @@
  */
 package org.springframework.data.elasticsearch.core;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.cluster.ClusterOperations;
 import org.springframework.data.elasticsearch.core.convert.ElasticsearchConverter;
 import org.springframework.data.elasticsearch.core.mapping.IndexCoordinates;
 import org.springframework.data.elasticsearch.core.routing.RoutingResolver;
 import org.springframework.data.elasticsearch.core.script.ScriptOperations;
 import org.springframework.data.elasticsearch.core.sql.SqlOperations;
+import org.springframework.lang.Nullable;
 
 /**
  * ElasticsearchOperations. Since 4.0 this interface only contains common helper functions, the other methods have been

src/main/java/org/springframework/data/elasticsearch/core/EntityOperations.java

@@ -17,7 +17,6 @@ package org.springframework.data.elasticsearch.core;
 
 import java.util.Map;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.core.convert.ConversionService;
 import org.springframework.data.elasticsearch.core.convert.ElasticsearchConverter;
 import org.springframework.data.elasticsearch.core.join.JoinField;
@@ -30,6 +29,7 @@ import org.springframework.data.mapping.IdentifierAccessor;
 import org.springframework.data.mapping.PersistentPropertyAccessor;
 import org.springframework.data.mapping.context.MappingContext;
 import org.springframework.data.mapping.model.ConvertingPropertyAccessor;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**

src/main/java/org/springframework/data/elasticsearch/core/IndexInformation.java

@@ -18,10 +18,10 @@ package org.springframework.data.elasticsearch.core;
 
 import java.util.List;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.document.Document;
 import org.springframework.data.elasticsearch.core.index.AliasData;
 import org.springframework.data.elasticsearch.core.index.Settings;
+import org.springframework.lang.Nullable;
 
 /**
  * Immutable object that holds information(name, settings, mappings, aliases) about an Index

src/main/java/org/springframework/data/elasticsearch/core/IndexOperations.java

@@ -19,10 +19,10 @@ import java.util.List;
 import java.util.Map;
 import java.util.Set;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.document.Document;
 import org.springframework.data.elasticsearch.core.index.*;
 import org.springframework.data.elasticsearch.core.mapping.IndexCoordinates;
+import org.springframework.lang.Nullable;
 
 /**
  * The operations for the

src/main/java/org/springframework/data/elasticsearch/core/IndexOperationsAdapter.java

@@ -22,10 +22,10 @@ import java.util.Map;
 import java.util.Objects;
 import java.util.Set;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.document.Document;
 import org.springframework.data.elasticsearch.core.index.*;
 import org.springframework.data.elasticsearch.core.mapping.IndexCoordinates;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**

src/main/java/org/springframework/data/elasticsearch/core/IndexedObjectInformation.java

@@ -15,7 +15,7 @@
  */
 package org.springframework.data.elasticsearch.core;
 
-import org.jspecify.annotations.Nullable;
+import org.springframework.lang.Nullable;
 
 /**
  * Value class capturing information about a newly indexed document in Elasticsearch.

src/main/java/org/springframework/data/elasticsearch/core/MultiGetItem.java

@@ -15,8 +15,8 @@
  */
 package org.springframework.data.elasticsearch.core;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.ElasticsearchErrorCause;
+import org.springframework.lang.Nullable;
 
 /**
  * Response object for items returned from multiget requests, encapsulating the returned data and potential error

src/main/java/org/springframework/data/elasticsearch/core/ReactiveDocumentOperations.java

@@ -326,6 +326,17 @@ public interface ReactiveDocumentOperations {
 	 */
 	Mono<String> delete(String id, Class<?> entityType);
 
+	/**
+	 * Delete the documents matching the given {@link Query} extracting index from entity metadata.
+	 *
+	 * @param query must not be {@literal null}.
+	 * @param entityType must not be {@literal null}.
+	 * @return a {@link Mono} emitting the number of the removed documents.
+	 * @deprecated since 5.3.0, use {@link #delete(DeleteQuery, Class)}
+	 */
+	@Deprecated
+	Mono<ByQueryResponse> delete(Query query, Class<?> entityType);
+
 	/**
 	 * Delete the documents matching the given {@link Query} extracting index from entity metadata.
 	 *
@@ -336,6 +347,18 @@ public interface ReactiveDocumentOperations {
 	 */
 	Mono<ByQueryResponse> delete(DeleteQuery query, Class<?> entityType);
 
+	/**
+	 * Delete the documents matching the given {@link Query} extracting index from entity metadata.
+	 *
+	 * @param query must not be {@literal null}.
+	 * @param entityType must not be {@literal null}.
+	 * @param index the target index, must not be {@literal null}
+	 * @return a {@link Mono} emitting the number of the removed documents.
+	 * @deprecated since 5.3.0, use {@link #delete(DeleteQuery, Class, IndexCoordinates)}
+	 */
+	@Deprecated
+	Mono<ByQueryResponse> delete(Query query, Class<?> entityType, IndexCoordinates index);
+
 	/**
 	 * Delete the documents matching the given {@link Query} extracting index from entity metadata.
 	 *

src/main/java/org/springframework/data/elasticsearch/core/ReactiveElasticsearchOperations.java

@@ -15,7 +15,6 @@
  */
 package org.springframework.data.elasticsearch.core;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.cluster.ReactiveClusterOperations;
 import org.springframework.data.elasticsearch.core.convert.ElasticsearchConverter;
 import org.springframework.data.elasticsearch.core.mapping.ElasticsearchPersistentEntity;
@@ -23,6 +22,7 @@ import org.springframework.data.elasticsearch.core.mapping.IndexCoordinates;
 import org.springframework.data.elasticsearch.core.routing.RoutingResolver;
 import org.springframework.data.elasticsearch.core.script.ReactiveScriptOperations;
 import org.springframework.data.elasticsearch.core.sql.ReactiveSqlOperations;
+import org.springframework.lang.Nullable;
 
 /**
  * Interface that specifies a basic set of Elasticsearch operations executed in a reactive way.

src/main/java/org/springframework/data/elasticsearch/core/ReactiveSearchHits.java

@@ -19,8 +19,8 @@ import reactor.core.publisher.Flux;
 
 import java.time.Duration;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.suggest.response.Suggest;
+import org.springframework.lang.Nullable;
 
 /**
  * Encapsulates a Flux of {@link SearchHit}s with additional information from the search.

src/main/java/org/springframework/data/elasticsearch/core/ReactiveSearchHitsImpl.java

@@ -19,8 +19,8 @@ import reactor.core.publisher.Flux;
 
 import java.time.Duration;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.suggest.response.Suggest;
+import org.springframework.lang.Nullable;
 
 /**
  * @author Peter-Josef Meisch

src/main/java/org/springframework/data/elasticsearch/core/SearchHit.java

@@ -23,9 +23,9 @@ import java.util.List;
 import java.util.Map;
 import java.util.stream.Collectors;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.document.Explanation;
 import org.springframework.data.elasticsearch.core.document.NestedMetaData;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**
@@ -48,12 +48,12 @@ public class SearchHit<T> {
 	@Nullable private final NestedMetaData nestedMetaData;
 	@Nullable private final String routing;
 	@Nullable private final Explanation explanation;
-	private final Map<String, Double> matchedQueries = new LinkedHashMap<>();
+	private final List<String> matchedQueries = new ArrayList<>();
 
 	public SearchHit(@Nullable String index, @Nullable String id, @Nullable String routing, float score,
 			@Nullable Object[] sortValues, @Nullable Map<String, List<String>> highlightFields,
 			@Nullable Map<String, SearchHits<?>> innerHits, @Nullable NestedMetaData nestedMetaData,
-			@Nullable Explanation explanation, @Nullable Map<String, Double> matchedQueries, T content) {
+			@Nullable Explanation explanation, @Nullable List<String> matchedQueries, T content) {
 		this.index = index;
 		this.id = id;
 		this.routing = routing;
@@ -73,7 +73,7 @@ public class SearchHit<T> {
 		this.content = content;
 
 		if (matchedQueries != null) {
-			this.matchedQueries.putAll(matchedQueries);
+			this.matchedQueries.addAll(matchedQueries);
 		}
 	}
 
@@ -194,7 +194,7 @@ public class SearchHit<T> {
 	 * @return the matched queries for this SearchHit.
 	 */
 	@Nullable
-	public Map<String, Double> getMatchedQueries() {
+	public List<String> getMatchedQueries() {
 		return matchedQueries;
 	}
 }

src/main/java/org/springframework/data/elasticsearch/core/SearchHitMapping.java

@@ -23,7 +23,6 @@ import java.util.List;
 import java.util.Map;
 import java.util.stream.Collectors;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.UncategorizedElasticsearchException;
 import org.springframework.data.elasticsearch.core.convert.ElasticsearchConverter;
 import org.springframework.data.elasticsearch.core.document.Document;
@@ -35,6 +34,7 @@ import org.springframework.data.elasticsearch.core.mapping.ElasticsearchPersiste
 import org.springframework.data.elasticsearch.core.suggest.response.CompletionSuggestion;
 import org.springframework.data.elasticsearch.core.suggest.response.Suggest;
 import org.springframework.data.mapping.context.MappingContext;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**

src/main/java/org/springframework/data/elasticsearch/core/SearchHitSupport.java

@@ -21,11 +21,11 @@ import java.util.List;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.domain.PageImpl;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.util.CloseableIterator;
 import org.springframework.data.util.ReactiveWrappers;
+import org.springframework.lang.Nullable;
 
 /**
  * Utility class with helper methods for working with {@link SearchHit}.

src/main/java/org/springframework/data/elasticsearch/core/SearchHits.java

@@ -19,9 +19,9 @@ import java.time.Duration;
 import java.util.Iterator;
 import java.util.List;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.suggest.response.Suggest;
 import org.springframework.data.util.Streamable;
+import org.springframework.lang.Nullable;
 
 /**
  * Encapsulates a list of {@link SearchHit}s with additional information from the search.

src/main/java/org/springframework/data/elasticsearch/core/SearchHitsImpl.java

@@ -19,9 +19,9 @@ import java.time.Duration;
 import java.util.Collections;
 import java.util.List;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.suggest.response.Suggest;
 import org.springframework.data.util.Lazy;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**

src/main/java/org/springframework/data/elasticsearch/core/SearchHitsIterator.java

@@ -17,8 +17,8 @@ package org.springframework.data.elasticsearch.core;
 
 import java.time.Duration;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.util.CloseableIterator;
+import org.springframework.lang.Nullable;
 
 /**
  * A {@link SearchHitsIterator} encapsulates {@link SearchHit} results that can be wrapped in a Java 8

src/main/java/org/springframework/data/elasticsearch/core/SearchOperations.java

@@ -18,11 +18,11 @@ package org.springframework.data.elasticsearch.core;
 import java.time.Duration;
 import java.util.List;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.mapping.IndexCoordinates;
 import org.springframework.data.elasticsearch.core.query.BaseQueryBuilder;
 import org.springframework.data.elasticsearch.core.query.MoreLikeThisQuery;
 import org.springframework.data.elasticsearch.core.query.Query;
+import org.springframework.lang.Nullable;
 
 /**
  * The operations for the
@@ -233,8 +233,7 @@ public interface SearchOperations {
 	Query idsQuery(List<String> ids);
 
 	/**
-	 * Creates a {@link BaseQueryBuilder} that has the given ids setto the parameter value. No other properties of the
+	 * Creates a {@link BaseQueryBuilder} that has the given ids setto the parameter value. No other properties of the bulder are set.
-	 * bulder are set.
 	 *
 	 * @param ids the list of ids must not be {@literal null}
 	 * @return query returning the documents with the given ids

src/main/java/org/springframework/data/elasticsearch/core/SearchScrollHits.java

@@ -15,7 +15,7 @@
  */
 package org.springframework.data.elasticsearch.core;
 
-import org.jspecify.annotations.Nullable;
+import org.springframework.lang.Nullable;
 
 /**
  * This interface is used to expose the current {@code scrollId} from the underlying scroll context.

src/main/java/org/springframework/data/elasticsearch/core/SearchShardStatistics.java

@@ -17,8 +17,8 @@ package org.springframework.data.elasticsearch.core;
 
 import java.util.List;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.ElasticsearchErrorCause;
+import org.springframework.lang.Nullable;
 
 /**
  * @author Haibo Liu

src/main/java/org/springframework/data/elasticsearch/core/StreamQueries.java

@@ -23,8 +23,8 @@ import java.util.concurrent.atomic.AtomicInteger;
 import java.util.function.Consumer;
 import java.util.function.Function;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.client.util.ScrollState;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**

src/main/java/org/springframework/data/elasticsearch/core/cluster/package-info.java

@@ -1,5 +1,6 @@
 /**
  * Interfaces and classes related to Elasticsearch cluster information and management.
  */
-@org.jspecify.annotations.NullMarked
+@org.springframework.lang.NonNullApi
+@org.springframework.lang.NonNullFields
 package org.springframework.data.elasticsearch.core.cluster;

src/main/java/org/springframework/data/elasticsearch/core/convert/DefaultElasticsearchTypeMapper.java

@@ -19,7 +19,6 @@ import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.convert.DefaultTypeMapper;
 import org.springframework.data.convert.SimpleTypeInformationMapper;
 import org.springframework.data.convert.TypeAliasAccessor;
@@ -28,6 +27,7 @@ import org.springframework.data.mapping.Alias;
 import org.springframework.data.mapping.PersistentEntity;
 import org.springframework.data.mapping.context.MappingContext;
 import org.springframework.data.util.TypeInformation;
+import org.springframework.lang.Nullable;
 
 /**
  * Elasticsearch specific {@link org.springframework.data.convert.TypeMapper} implementation.

src/main/java/org/springframework/data/elasticsearch/core/convert/ElasticsearchConverter.java

@@ -15,7 +15,6 @@
  */
 package org.springframework.data.elasticsearch.core.convert;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.convert.EntityConverter;
 import org.springframework.data.elasticsearch.core.document.Document;
 import org.springframework.data.elasticsearch.core.mapping.ElasticsearchPersistentEntity;
@@ -24,6 +23,7 @@ import org.springframework.data.elasticsearch.core.mapping.PropertyValueConverte
 import org.springframework.data.elasticsearch.core.query.Query;
 import org.springframework.data.projection.ProjectionFactory;
 import org.springframework.data.projection.SpelAwareProxyProjectionFactory;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**

src/main/java/org/springframework/data/elasticsearch/core/convert/ElasticsearchTypeMapper.java

@@ -17,11 +17,11 @@ package org.springframework.data.elasticsearch.core.convert;
 
 import java.util.Map;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.convert.TypeMapper;
 import org.springframework.data.elasticsearch.core.mapping.ElasticsearchPersistentEntity;
 import org.springframework.data.elasticsearch.core.mapping.ElasticsearchPersistentProperty;
 import org.springframework.data.mapping.context.MappingContext;
+import org.springframework.lang.Nullable;
 
 /**
  * Elasticsearch specific {@link TypeMapper} definition.

src/main/java/org/springframework/data/elasticsearch/core/convert/MappingConversionException.java

@@ -15,7 +15,7 @@
  */
 package org.springframework.data.elasticsearch.core.convert;
 
-import org.jspecify.annotations.Nullable;
+import org.springframework.lang.Nullable;
 
 /**
  * @since 5.3

src/main/java/org/springframework/data/elasticsearch/core/convert/MappingElasticsearchConverter.java

@@ -24,7 +24,6 @@ import java.util.stream.Collectors;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.jetbrains.annotations.NotNull;
-import org.jspecify.annotations.Nullable;
 import org.springframework.beans.BeansException;
 import org.springframework.beans.factory.InitializingBean;
 import org.springframework.context.ApplicationContext;
@@ -39,7 +38,6 @@ import org.springframework.core.env.Environment;
 import org.springframework.core.env.EnvironmentCapable;
 import org.springframework.core.env.StandardEnvironment;
 import org.springframework.data.convert.CustomConversions;
-import org.springframework.data.domain.Sort;
 import org.springframework.data.elasticsearch.annotations.FieldType;
 import org.springframework.data.elasticsearch.annotations.ScriptedField;
 import org.springframework.data.elasticsearch.core.document.Document;
@@ -52,7 +50,6 @@ import org.springframework.data.elasticsearch.core.query.Criteria;
 import org.springframework.data.elasticsearch.core.query.CriteriaQuery;
 import org.springframework.data.elasticsearch.core.query.FetchSourceFilter;
 import org.springframework.data.elasticsearch.core.query.Field;
-import org.springframework.data.elasticsearch.core.query.Order;
 import org.springframework.data.elasticsearch.core.query.Query;
 import org.springframework.data.elasticsearch.core.query.SeqNoPrimaryTerm;
 import org.springframework.data.elasticsearch.core.query.SourceFilter;
@@ -66,6 +63,7 @@ import org.springframework.data.mapping.model.*;
 import org.springframework.data.util.TypeInformation;
 import org.springframework.expression.spel.standard.SpelExpressionParser;
 import org.springframework.format.datetime.DateFormatterRegistrar;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;
 import org.springframework.util.CollectionUtils;
@@ -394,7 +392,7 @@ public class MappingElasticsearchConverter
 				}
 
 				if (source instanceof SearchDocument searchDocument) {
-					populateScriptedFields(targetEntity, result, searchDocument);
+					populateScriptFields(targetEntity, result, searchDocument);
 				}
 				return result;
 			} catch (ConversionException e) {
@@ -652,16 +650,7 @@ public class MappingElasticsearchConverter
 			return conversionService.convert(value, target);
 		}
 
-		/**
+		private <T> void populateScriptFields(ElasticsearchPersistentEntity<?> entity, T result,
-		 * Checks if any of the properties of the entity is annotated with
-		 *
-		 * @{@link ScriptedField}. If so, the value of this property is set from the returned fields in the document.
-		 * @param entity the entity to defining the persistent property
-		 * @param result the rsult to populate
-		 * @param searchDocument the search result caontaining the fields
-		 * @param <T> the result type
-		 */
-		private <T> void populateScriptedFields(ElasticsearchPersistentEntity<?> entity, T result,
 				SearchDocument searchDocument) {
 			Map<String, List<Object>> fields = searchDocument.getFields();
 			entity.doWithProperties((SimplePropertyHandler) property -> {
@@ -670,15 +659,10 @@ public class MappingElasticsearchConverter
 					// noinspection ConstantConditions
 					String name = scriptedField.name().isEmpty() ? property.getName() : scriptedField.name();
 					if (fields.containsKey(name)) {
-						if (property.isCollectionLike()) {
-							List<Object> values = searchDocument.getFieldValues(name);
-							entity.getPropertyAccessor(result).setProperty(property, values);
-						} else {
 						Object value = searchDocument.getFieldValue(name);
 						entity.getPropertyAccessor(result).setProperty(property, value);
 					}
 				}
-				}
 			});
 		}
 
@@ -1247,7 +1231,7 @@ public class MappingElasticsearchConverter
 			return;
 		}
 
-		updatePropertiesInFieldsSortAndSourceFilter(query, domainClass);
+		updatePropertiesInFieldsAndSourceFilter(query, domainClass);
 
 		if (query instanceof CriteriaQuery criteriaQuery) {
 			updatePropertiesInCriteriaQuery(criteriaQuery, domainClass);
@@ -1258,14 +1242,7 @@ public class MappingElasticsearchConverter
 		}
 	}
 
-	/**
+	private void updatePropertiesInFieldsAndSourceFilter(Query query, Class<?> domainClass) {
-	 * replaces the names of fields in the query, the sort or soucre filters with the field names used in Elasticsearch
-	 * when they are defined on the ElasticsearchProperties
-	 *
-	 * @param query the query to process
-	 * @param domainClass the domain class (persistent entity)
-	 */
-	private void updatePropertiesInFieldsSortAndSourceFilter(Query query, Class<?> domainClass) {
 
 		ElasticsearchPersistentEntity<?> persistentEntity = mappingContext.getPersistentEntity(domainClass);
 
@@ -1273,12 +1250,12 @@ public class MappingElasticsearchConverter
 			List<String> fields = query.getFields();
 
 			if (!fields.isEmpty()) {
-				query.setFields(propertyToFieldNames(fields, persistentEntity));
+				query.setFields(updateFieldNames(fields, persistentEntity));
 			}
 
 			List<String> storedFields = query.getStoredFields();
 			if (!CollectionUtils.isEmpty(storedFields)) {
-				query.setStoredFields(propertyToFieldNames(storedFields, persistentEntity));
+				query.setStoredFields(updateFieldNames(storedFields, persistentEntity));
 			}
 
 			SourceFilter sourceFilter = query.getSourceFilter();
@@ -1289,60 +1266,37 @@ public class MappingElasticsearchConverter
 				String[] excludes = null;
 
 				if (sourceFilter.getIncludes() != null) {
-					includes = propertyToFieldNames(Arrays.asList(sourceFilter.getIncludes()), persistentEntity)
+					includes = updateFieldNames(Arrays.asList(sourceFilter.getIncludes()), persistentEntity)
 							.toArray(new String[] {});
 				}
 
 				if (sourceFilter.getExcludes() != null) {
-					excludes = propertyToFieldNames(Arrays.asList(sourceFilter.getExcludes()), persistentEntity)
+					excludes = updateFieldNames(Arrays.asList(sourceFilter.getExcludes()), persistentEntity)
 							.toArray(new String[] {});
 				}
 
 				query.addSourceFilter(new FetchSourceFilter(sourceFilter.fetchSource(), includes, excludes));
 			}
-
-			if (query.getSort() != null) {
-				var sort = query.getSort();
-				// stream the orders and map them to a new order with the changed names,
-				// then replace the existing sort with a new sort containing the new orders.
-				var newOrders = sort.stream().map(order -> {
-					var fieldNames = updateFieldNames(order.getProperty(), persistentEntity);
-
-					if (order instanceof Order springDataElasticsearchOrder) {
-						return springDataElasticsearchOrder.withProperty(fieldNames);
-					} else {
-						return new Sort.Order(order.getDirection(),
-								fieldNames,
-								order.isIgnoreCase(),
-								order.getNullHandling());
-					}
-				}).toList();
-
-				if (query instanceof BaseQuery baseQuery) {
-					baseQuery.setSort(Sort.by(newOrders));
-				}
-			}
 		}
 	}
 
 	/**
-	 * replaces property name of a property of the persistentEntity with the corresponding fieldname. If no such property
+	 * relaces the fieldName with the property name of a property of the persistentEntity with the corresponding
-	 * exists, the original fieldName is kept.
+	 * fieldname. If no such property exists, the original fieldName is kept.
 	 *
-	 * @param propertyNames list of fieldnames
+	 * @param fieldNames list of fieldnames
 	 * @param persistentEntity the persistent entity to check
 	 * @return an updated list of field names
 	 */
-	private List<String> propertyToFieldNames(List<String> propertyNames,
+	private List<String> updateFieldNames(List<String> fieldNames, ElasticsearchPersistentEntity<?> persistentEntity) {
-			ElasticsearchPersistentEntity<?> persistentEntity) {
+		return fieldNames.stream().map(fieldName -> updateFieldName(persistentEntity, fieldName))
-		return propertyNames.stream().map(propertyName -> propertyToFieldName(persistentEntity, propertyName))
 				.collect(Collectors.toList());
 	}
 
 	@NotNull
-	private String propertyToFieldName(ElasticsearchPersistentEntity<?> persistentEntity, String propertyName) {
+	private String updateFieldName(ElasticsearchPersistentEntity<?> persistentEntity, String fieldName) {
-		ElasticsearchPersistentProperty persistentProperty = persistentEntity.getPersistentProperty(propertyName);
+		ElasticsearchPersistentProperty persistentProperty = persistentEntity.getPersistentProperty(fieldName);
-		return persistentProperty != null ? persistentProperty.getFieldName() : propertyName;
+		return persistentProperty != null ? persistentProperty.getFieldName() : fieldName;
 	}
 
 	private void updatePropertiesInCriteriaQuery(CriteriaQuery criteriaQuery, Class<?> domainClass) {
@@ -1372,85 +1326,15 @@ public class MappingElasticsearchConverter
 			return;
 		}
 
-		var propertyNamesUpdate = updatePropertyNames(persistentEntity, field.getName());
+		String[] fieldNames = field.getName().split("\\.");
-
-		var fieldNames = propertyNamesUpdate.names();
-		field.setName(String.join(".", fieldNames));
-
-		if (propertyNamesUpdate.propertyCount() > 1 && propertyNamesUpdate.nestedProperty()) {
-			List<String> propertyNames = Arrays.asList(fieldNames);
-			field.setPath(String.join(".", propertyNames.subList(0, propertyNamesUpdate.propertyCount - 1)));
-		}
-
-		if (propertyNamesUpdate.persistentProperty != null) {
-
-			if (propertyNamesUpdate.persistentProperty.hasPropertyValueConverter()) {
-				PropertyValueConverter propertyValueConverter = Objects
-						.requireNonNull(propertyNamesUpdate.persistentProperty.getPropertyValueConverter());
-				criteria.getQueryCriteriaEntries().forEach(criteriaEntry -> {
-
-					if (criteriaEntry.getKey().hasValue()) {
-						Object value = criteriaEntry.getValue();
-
-						if (value.getClass().isArray()) {
-							Object[] objects = (Object[]) value;
-
-							for (int i = 0; i < objects.length; i++) {
-								objects[i] = propertyValueConverter.write(objects[i]);
-							}
-						} else {
-							criteriaEntry.setValue(propertyValueConverter.write(value));
-						}
-					}
-				});
-			}
-
-			org.springframework.data.elasticsearch.annotations.Field fieldAnnotation = propertyNamesUpdate.persistentProperty
-					.findAnnotation(org.springframework.data.elasticsearch.annotations.Field.class);
-
-			if (fieldAnnotation != null) {
-				field.setFieldType(fieldAnnotation.type());
-			}
-		}
-	}
-
-	static record PropertyNamesUpdate(
-			String[] names,
-			Boolean nestedProperty,
-			Integer propertyCount,
-			ElasticsearchPersistentProperty persistentProperty) {
-	}
-
-	@Override
-	public String updateFieldNames(String propertyPath, ElasticsearchPersistentEntity<?> persistentEntity) {
-
-		Assert.notNull(propertyPath, "propertyPath must not be null");
-		Assert.notNull(persistentEntity, "persistentEntity must not be null");
-
-		var propertyNamesUpdate = updatePropertyNames(persistentEntity, propertyPath);
-		return String.join(".", propertyNamesUpdate.names());
-	}
-
-	/**
-	 * Parse a propertyPath and replace the path values with the field names from a persistentEntity. path entries not
-	 * found in the entity are kept as they are.
-	 *
-	 * @return the eventually modified names, a flag if a nested entity was encountered the number of processed
-	 *         propertiesand the last processed PersistentProperty.
-	 */
-	PropertyNamesUpdate updatePropertyNames(ElasticsearchPersistentEntity<?> persistentEntity, String propertyPath) {
-
-		String[] propertyNames = propertyPath.split("\\.");
-		String[] fieldNames = Arrays.copyOf(propertyNames, propertyNames.length);
 
 		ElasticsearchPersistentEntity<?> currentEntity = persistentEntity;
 		ElasticsearchPersistentProperty persistentProperty = null;
-
 		int propertyCount = 0;
 		boolean isNested = false;
 
-		for (int i = 0; i < propertyNames.length; i++) {
+		for (int i = 0; i < fieldNames.length; i++) {
-			persistentProperty = currentEntity.getPersistentProperty(propertyNames[i]);
+			persistentProperty = currentEntity.getPersistentProperty(fieldNames[i]);
 
 			if (persistentProperty != null) {
 				propertyCount++;
@@ -1477,8 +1361,77 @@ public class MappingElasticsearchConverter
 			}
 		}
 
-		return new PropertyNamesUpdate(fieldNames, isNested, propertyCount, persistentProperty);
+		field.setName(String.join(".", fieldNames));
+
+		if (propertyCount > 1 && isNested) {
+			List<String> propertyNames = Arrays.asList(fieldNames);
+			field.setPath(String.join(".", propertyNames.subList(0, propertyCount - 1)));
 		}
+
+		if (persistentProperty != null) {
+
+			if (persistentProperty.hasPropertyValueConverter()) {
+				PropertyValueConverter propertyValueConverter = Objects
+						.requireNonNull(persistentProperty.getPropertyValueConverter());
+				criteria.getQueryCriteriaEntries().forEach(criteriaEntry -> {
+
+					if (criteriaEntry.getKey().hasValue()) {
+						Object value = criteriaEntry.getValue();
+
+						if (value.getClass().isArray()) {
+							Object[] objects = (Object[]) value;
+
+							for (int i = 0; i < objects.length; i++) {
+								objects[i] = propertyValueConverter.write(objects[i]);
+							}
+						} else {
+							criteriaEntry.setValue(propertyValueConverter.write(value));
+						}
+					}
+				});
+			}
+
+			org.springframework.data.elasticsearch.annotations.Field fieldAnnotation = persistentProperty
+					.findAnnotation(org.springframework.data.elasticsearch.annotations.Field.class);
+
+			if (fieldAnnotation != null) {
+				field.setFieldType(fieldAnnotation.type());
+			}
+		}
+	}
+
+	@Override
+	public String updateFieldNames(String propertyPath, ElasticsearchPersistentEntity<?> persistentEntity) {
+
+		Assert.notNull(propertyPath, "propertyPath must not be null");
+		Assert.notNull(persistentEntity, "persistentEntity must not be null");
+
+		var properties = propertyPath.split("\\.", 2);
+
+		if (properties.length > 0) {
+			var propertyName = properties[0];
+			var fieldName = updateFieldName(persistentEntity, propertyName);
+
+			if (properties.length > 1) {
+				var persistentProperty = persistentEntity.getPersistentProperty(propertyName);
+
+				if (persistentProperty != null) {
+					ElasticsearchPersistentEntity<?> nestedPersistentEntity = mappingContext
+							.getPersistentEntity(persistentProperty);
+					if (nestedPersistentEntity != null) {
+						return fieldName + '.' + updateFieldNames(properties[1], nestedPersistentEntity);
+					} else {
+						return fieldName;
+					}
+				}
+			}
+			return fieldName;
+		} else {
+			return propertyPath;
+		}
+
+	}
+
 	// endregion
 
 	@SuppressWarnings("ClassCanBeRecord")

src/main/java/org/springframework/data/elasticsearch/core/convert/package-info.java

@@ -1,2 +1,3 @@
-@org.jspecify.annotations.NullMarked
+@org.springframework.lang.NonNullApi
+@org.springframework.lang.NonNullFields
 package org.springframework.data.elasticsearch.core.convert;

src/main/java/org/springframework/data/elasticsearch/core/document/Document.java

@@ -20,9 +20,9 @@ import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.function.Function;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.convert.ConversionException;
 import org.springframework.data.elasticsearch.support.StringObjectMap;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**

src/main/java/org/springframework/data/elasticsearch/core/document/Explanation.java

@@ -18,7 +18,7 @@ package org.springframework.data.elasticsearch.core.document;
 import java.util.List;
 import java.util.Objects;
 
-import org.jspecify.annotations.Nullable;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**

src/main/java/org/springframework/data/elasticsearch/core/document/MapDocument.java

@@ -21,9 +21,10 @@ import java.util.Map;
 import java.util.Set;
 import java.util.function.BiConsumer;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.support.DefaultStringObjectMap;
+import org.springframework.data.elasticsearch.support.StringObjectMap;
 import org.springframework.data.mapping.MappingException;
+import org.springframework.lang.Nullable;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;

src/main/java/org/springframework/data/elasticsearch/core/document/NestedMetaData.java

@@ -15,7 +15,7 @@
  */
 package org.springframework.data.elasticsearch.core.document;
 
-import org.jspecify.annotations.Nullable;
+import org.springframework.lang.Nullable;
 
 /**
  * meta data returned for nested inner hits.

src/main/java/org/springframework/data/elasticsearch/core/document/SearchDocument.java

@@ -18,7 +18,7 @@ package org.springframework.data.elasticsearch.core.document;
 import java.util.List;
 import java.util.Map;
 
-import org.jspecify.annotations.Nullable;
+import org.springframework.lang.Nullable;
 
 /**
  * Extension to {@link Document} exposing search response related data.
@@ -57,20 +57,6 @@ public interface SearchDocument extends Document {
 		return (V) values.get(0);
 	}
 
-	/**
-	 * @param name the field name
-	 * @param <V> the type of elements
-	 * @return the values of the given field.
-	 */
-	@Nullable
-	default <V> List<V> getFieldValues(final String name) {
-		List<Object> values = getFields().get(name);
-		if (values == null) {
-			return null;
-		}
-		return (List<V>) values;
-	}
-
 	/**
 	 * @return the sort values for the search hit
 	 */
@@ -125,5 +111,5 @@ public interface SearchDocument extends Document {
 	 * @return the matched queries for the SearchHit.
 	 */
 	@Nullable
-	Map<String, Double> getMatchedQueries();
+	List<String> getMatchedQueries();
 }

src/main/java/org/springframework/data/elasticsearch/core/document/SearchDocumentAdapter.java

@@ -22,7 +22,7 @@ import java.util.Map;
 import java.util.Set;
 import java.util.function.BiConsumer;
 
-import org.jspecify.annotations.Nullable;
+import org.springframework.lang.Nullable;
 
 /**
  * {@link SearchDocument} implementation using a {@link Document} delegate.
@@ -41,12 +41,12 @@ public class SearchDocumentAdapter implements SearchDocument {
 	private final Map<String, SearchDocumentResponse> innerHits = new HashMap<>();
 	@Nullable private final NestedMetaData nestedMetaData;
 	@Nullable private final Explanation explanation;
-	@Nullable private final Map<String, Double> matchedQueries;
+	@Nullable private final List<String> matchedQueries;
 	@Nullable private final String routing;
 
 	public SearchDocumentAdapter(Document delegate, float score, Object[] sortValues, Map<String, List<Object>> fields,
 			Map<String, List<String>> highlightFields, Map<String, SearchDocumentResponse> innerHits,
-			@Nullable NestedMetaData nestedMetaData, @Nullable Explanation explanation, @Nullable Map<String, Double> matchedQueries,
+			@Nullable NestedMetaData nestedMetaData, @Nullable Explanation explanation, @Nullable List<String> matchedQueries,
 			@Nullable String routing) {
 
 		this.delegate = delegate;
@@ -249,7 +249,7 @@ public class SearchDocumentAdapter implements SearchDocument {
 
 	@Override
 	@Nullable
-	public Map<String, Double> getMatchedQueries() {
+	public List<String> getMatchedQueries() {
 		return matchedQueries;
 	}
 

src/main/java/org/springframework/data/elasticsearch/core/document/SearchDocumentResponse.java

@@ -20,10 +20,10 @@ import java.util.List;
 import java.util.concurrent.CompletableFuture;
 import java.util.function.Function;
 
-import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.AggregationsContainer;
 import org.springframework.data.elasticsearch.core.SearchShardStatistics;
 import org.springframework.data.elasticsearch.core.suggest.response.Suggest;
+import org.springframework.lang.Nullable;
 
 /**
  * This represents the complete search response from Elasticsearch, including the returned documents.

src/main/java/org/springframework/data/elasticsearch/core/document/package-info.java

@@ -1,5 +1,6 @@
 /**
  * Classes related to the Document structure of Elasticsearch documents and search responses.
  */
-@org.jspecify.annotations.NullMarked
+@org.springframework.lang.NonNullApi
+@org.springframework.lang.NonNullFields
 package org.springframework.data.elasticsearch.core.document;

src/main/java/org/springframework/data/elasticsearch/core/event/package-info.java

@@ -1,5 +1,6 @@
 /**
  * classes and interfaces related to Spring Data Elasticsearch events and callbacks.
  */
-@org.jspecify.annotations.NullMarked
+@org.springframework.lang.NonNullApi
+@org.springframework.lang.NonNullFields
 package org.springframework.data.elasticsearch.core.event;