Use the new Rest5Client as default, provide the old RestClient as optional.

Original Pull Request: #3125
Closes #3117

Signed-off-by: Peter-Josef Meisch <pj.meisch@sothawo.com>

.gitignore

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

.mvn/extensions.xml

@@ -3,6 +3,6 @@
 	<extension>
 		<groupId>io.spring.develocity.conventions</groupId>
 		<artifactId>develocity-conventions-maven-extension</artifactId>
-		<version>0.0.19</version>
+		<version>0.0.22</version>
 	</extension>
 </extensions>

.mvn/jvm.config

@@ -0,0 +1,14 @@
+--add-exports jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED
+--add-exports jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED
+--add-exports jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED
+--add-exports jdk.compiler/com.sun.tools.javac.model=ALL-UNNAMED
+--add-exports jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED
+--add-exports jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED
+--add-exports jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED
+--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 [official documentation](https://docs.spring.io/spring-data/elasticsearch/docs/current/reference/html/#elasticsearch.clients.configuration).
+Please check the https://docs.spring.io/spring-data/elasticsearch/docs/current/reference/html/#elasticsearch.clients.configuration[official documentation].
 
 === Maven configuration
 
@@ -168,7 +168,7 @@ Building the documentation builds also the project without running tests.
  $ ./mvnw clean install -Pantora
 ----
 
-The generated documentation is available from `target/antora/site/index.html`.
+The generated documentation is available from `target/site/index.html`.
 
 == Examples
 

ci/pipeline.properties

@@ -1,25 +1,20 @@
 # Java versions
-java.main.tag=17.0.13_11-jdk-focal
+java.main.tag=24.0.1_9-jdk-noble
-java.next.tag=23.0.1_11-jdk-noble
+java.next.tag=24.0.1_9-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.4.4.version=4.4.25
+docker.mongodb.6.0.version=6.0.23
-docker.mongodb.5.0.version=5.0.21
+docker.mongodb.7.0.version=7.0.20
-docker.mongodb.6.0.version=6.0.10
+docker.mongodb.8.0.version=8.0.9
-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>5.4.0</version>
+	<version>6.0.0-SNAPSHOT</version>
 
 	<parent>
 		<groupId>org.springframework.data.build</groupId>
 		<artifactId>spring-data-parent</artifactId>
-		<version>3.4.0</version>
+		<version>4.0.0-SNAPSHOT</version>
 	</parent>
 
 	<name>Spring Data Elasticsearch</name>
@@ -18,10 +18,10 @@
 	<url>https://github.com/spring-projects/spring-data-elasticsearch</url>
 
 	<properties>
-		<springdata.commons>3.4.0</springdata.commons>
+		<springdata.commons>4.0.0-SNAPSHOT</springdata.commons>
 
 		<!-- version of the ElasticsearchClient	-->
-		<elasticsearch-java>8.15.3</elasticsearch-java>
+		<elasticsearch-java>9.0.3</elasticsearch-java>
 
 		<hoverfly>0.19.0</hoverfly>
 		<log4j>2.23.1</log4j>
@@ -132,6 +132,27 @@
 			</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>
@@ -450,8 +471,20 @@
 	</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>
+		</repository>
 	</repositories>
 
 </project>

src/main/antora/antora-playbook.yml

@@ -17,7 +17,7 @@ content:
     - url: https://github.com/spring-projects/spring-data-commons
       # Refname matching:
       # https://docs.antora.org/antora/latest/playbook/content-refname-matching/
-      branches: [ main, 3.2.x ]
+      branches: [ main, 3.4.x, 3.3.x ]
       start_path: src/main/antora
 asciidoc:
   attributes:

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

@@ -11,6 +11,8 @@
 *** xref:migration-guides/migration-guide-5.1-5.2.adoc[]
 *** 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.springframework.lang.Nullable;
+import org.jspecify.annotations.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.restclient]]
+[[elasticsearch.clients.rest5client]]
-== Imperative Rest Client
+== Imperative Rest5Client
 
-To use the imperative (non-reactive) client, a configuration bean must be configured like this:
+To use the imperative (non-reactive) Rest5Client, a configuration bean must be configured like this:
 
 ====
 [source,java]
@@ -31,7 +31,81 @@ 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:
@@ -61,8 +135,8 @@ 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.reactiverestclient]]
+[[elasticsearch.clients.reactiverest5client]]
-== Reactive Rest Client
+== Reactive Rest5Client
 
 When working with the reactive stack, the configuration must be derived from a different class:
 
@@ -99,6 +173,65 @@ 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;                           <.>
 
@@ -183,8 +316,8 @@ 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.rest]]
+[[elasticsearch.clients.configuration.callbacks.rest5]]
-==== Configuration of the low level Elasticsearch `RestClient`:
+==== Configuration of the low level Elasticsearch `Rest5Client`:
 
 This callback provides a `org.elasticsearch.client.RestClientBuilder` that can be used to configure the Elasticsearch
 `RestClient`:
@@ -193,7 +326,24 @@ This callback provides a `org.elasticsearch.client.RestClientBuilder` that can b
 ----
 ClientConfiguration.builder()
     .connectedTo("localhost:9200", "localhost:9291")
-    .withClientConfigurer(ElasticsearchClients.ElasticsearchRestClientConfigurationCallback.from(restClientBuilder -> {
+    .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`:
+
+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(RestClients.ElasticsearchRestClientConfigurationCallback.from(restClientBuilder -> {
         // configure the Elasticsearch RestClient
         return restClientBuilder;
     }))
@@ -201,10 +351,29 @@ ClientConfiguration.builder()
 ----
 ====
 
-[[elasticsearch.clients.configurationcallbacks.httpasync]]
+[[elasticsearch.clients.configurationcallbacks.httpasync5]]
-==== Configuration of the HttpAsyncClient used by the low level Elasticsearch `RestClient`:
+==== Configuration of the HttpAsyncClient used by the low level Elasticsearch `Rest5Client`:
 
-This callback provides a `org.apache.http.impl.nio.client.HttpAsyncClientBuilder` to configure the HttpCLient that is
+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`:
+
+This callback provides a `org.apache.http.impl.nio.client.HttpAsyncClientBuilder` to configure the HttpClient that is
 used by the `RestClient`.
 
 ====
@@ -212,7 +381,7 @@ used by the `RestClient`.
 ----
 ClientConfiguration.builder()
     .connectedTo("localhost:9200", "localhost:9291")
-    .withClientConfigurer(ElasticsearchClients.ElasticsearchHttpClientConfigurationCallback.from(httpAsyncClientBuilder -> {
+    .withClientConfigurer(RestClients.ElasticsearchHttpClientConfigurationCallback.from(httpAsyncClientBuilder -> {
         // configure the HttpAsyncClient
         return httpAsyncClientBuilder;
     }))

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

@@ -1,6 +1,22 @@
 [[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.
+* 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/misc.adoc

@@ -365,6 +365,8 @@ operations.putScript(                            <.>
 
 To use a search template in a search query, Spring Data Elasticsearch provides the `SearchTemplateQuery`, an implementation of the `org.springframework.data.elasticsearch.core.query.Query` interface.
 
+NOTE: Although `SearchTemplateQuery` is an implementation of the `Query` interface, not all of the functionality provided by the base class is available for a `SearchTemplateQuery` like setting a `Pageable` or a `Sort`. Values for this functionality must be added to the stored script like shown in the following example for paging parameters. If these values are set on the `Query` object, they will be ignored.
+
 In the following code, we will add a call using a search template query to a custom repository implementation (see
 xref:repositories/custom-implementations.adoc[]) as an example how this can be integrated into a repository call.
 
@@ -449,4 +451,3 @@ var query = Query.findAll().addSort(Sort.by(order));
 About the filter query: It is not possible to use a `CriteriaQuery` here, as this query would be converted into a Elasticsearch nested query which does not work in the filter context. So only `StringQuery` or `NativeQuery` can be used here. When using one of these, like the term query above, the Elasticsearch field names must be used, so take care, when these are redefined with the `@Field(name="...")` definition.
 
 For the definition of the order path and the nested paths, the Java entity property names should be used.
-

src/main/antora/modules/ROOT/pages/elasticsearch/repositories/elasticsearch-repository-queries.adoc

@@ -10,7 +10,9 @@ The Elasticsearch module supports all basic query building feature as string que
 === Declared queries
 
 Deriving the query from the method name is not always sufficient and/or may result in unreadable method names.
-In this case one might make use of the `@Query` annotation (see xref:elasticsearch/repositories/elasticsearch-repository-queries.adoc#elasticsearch.query-methods.at-query[Using @Query Annotation] ).
+In this case one might make use of the `@Query` annotation (see xref:elasticsearch/repositories/elasticsearch-repository-queries.adoc#elasticsearch.query-methods.at-query[Using the @Query Annotation] ).
+
+Another possibility is the use of a search-template, (see xref:elasticsearch/repositories/elasticsearch-repository-queries.adoc#elasticsearch.query-methods.at-searchtemplate-query[Using the @SearchTemplateQuery Annotation] ).
 
 [[elasticsearch.query-methods.criterions]]
 == Query creation
@@ -312,11 +314,13 @@ Repository methods can be defined to have the following return types for returni
 * `SearchPage<T>`
 
 [[elasticsearch.query-methods.at-query]]
-== Using @Query Annotation
+== Using the @Query Annotation
 
 .Declare query on the method using the `@Query` annotation.
 ====
-The arguments passed to the method can be inserted into placeholders in the query string. The placeholders are of the form `?0`, `?1`, `?2` etc. for the first, second, third parameter and so on.
+The arguments passed to the method can be inserted into placeholders in the query string.
+The placeholders are of the form `?0`, `?1`, `?2` etc. for the first, second, third parameter and so on.
+
 [source,java]
 ----
 interface BookRepository extends ElasticsearchRepository<Book, String> {
@@ -341,15 +345,20 @@ It will be sent to Easticsearch as value of the query element; if for example th
 }
 ----
 ====
+
 .`@Query` annotation on a method taking a Collection argument
 ====
 A repository method such as
+
 [source,java]
 ----
 @Query("{\"ids\": {\"values\": ?0 }}")
 List<SampleEntity> getByIds(Collection<String> ids);
 ----
-would make an https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-ids-query.html[IDs query] to return all the matching documents. So calling the method with a `List` of `["id1", "id2", "id3"]` would produce the query body
+
+would make an https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-ids-query.html[IDs query] to return all the matching documents.
+So calling the method with a `List` of `["id1", "id2", "id3"]` would produce the query body
+
 [source,json]
 ----
 {
@@ -369,7 +378,6 @@ would make an https://www.elastic.co/guide/en/elasticsearch/reference/current/qu
 ====
 https://docs.spring.io/spring-framework/reference/core/expressions.html[SpEL expression] is also supported when defining query in `@Query`.
 
-
 [source,java]
 ----
 interface BookRepository extends ElasticsearchRepository<Book, String> {
@@ -411,6 +419,7 @@ If for example the function is called with the parameter _John_, it would produc
 .accessing parameter property.
 ====
 Supposing that we have the following class as query parameter type:
+
 [source,java]
 ----
 public record QueryParameter(String value) {
@@ -444,7 +453,9 @@ We can pass `new QueryParameter("John")` as the parameter now, and it will produ
 
 .accessing bean property.
 ====
-https://docs.spring.io/spring-framework/reference/core/expressions/language-ref/bean-references.html[Bean property] is also supported to access. Given that there is a bean named `queryParameter` of type `QueryParameter`, we can access the bean with symbol `@` rather than `#`, and there is no need to declare a parameter of type `QueryParameter` in the query method:
+https://docs.spring.io/spring-framework/reference/core/expressions/language-ref/bean-references.html[Bean property] is also supported to access.
+Given that there is a bean named `queryParameter` of type `QueryParameter`, we can access the bean with symbol `@` rather than `#`, and there is no need to declare a parameter of type `QueryParameter` in the query method:
+
 [source,java]
 ----
 interface BookRepository extends ElasticsearchRepository<Book, String> {
@@ -493,6 +504,7 @@ interface BookRepository extends ElasticsearchRepository<Book, String> {
 NOTE: collection values should not be quoted when declaring the elasticsearch json query.
 
 A collection of `names` like `List.of("name1", "name2")` will produce the following terms query:
+
 [source,json]
 ----
 {
@@ -532,6 +544,7 @@ interface BookRepository extends ElasticsearchRepository<Book, String> {
     Page<Book> findByName(Collection<QueryParameter> parameters, Pageable pageable);
 }
 ----
+
 This will extract all the `value` property values as a new `Collection` from `QueryParameter` collection, thus takes the same effect as above.
 ====
 
@@ -560,3 +573,20 @@ interface BookRepository extends ElasticsearchRepository<Book, String> {
 ----
 
 ====
+
+[[elasticsearch.query-methods.at-searchtemplate-query]]
+== Using the @SearchTemplateQuery Annotation
+
+When using Elasticsearch search templates - (see xref:elasticsearch/misc.adoc#elasticsearch.misc.searchtemplates [Search Template support]) it is possible to specify that a repository method should use a template by adding the `@SearchTemplateQuery` annotation to that method.
+
+Let's assume that there is a search template stored with the name "book-by-title" and this template need a parameter named "title", then a repository method using that search template can be defined like this:
+
+[source,java]
+----
+interface BookRepository extends ElasticsearchRepository<Book, String> {
+    @SearchTemplateQuery(id = "book-by-title")
+    SearchHits<Book> findByTitle(String title);
+}
+----
+
+The parameters of the repository method are sent to the seacrh template as key/value pairs where the key is the parameter name and the value is taken from the actual value when the method is invoked.

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 +6,13 @@ 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
-| 2024.1 (in development) | 5.3.x | 8.15.3 | 6.1.x
+| 2025.1 (in development) | 6.0.x | 9.0.3 | 7.0.x
-| 2024.0  | 5.3.1 | 8.13.4 | 6.1.x
+| 2025.0 | 5.5.x | 8.18.1 | 6.2.x
-| 2023.1 (Vaughan) | 5.2.x | 8.11.1 | 6.1.x
+| 2024.1 | 5.4.x | 8.15.5 | 6.1.x
-| 2023.0 (Ullmann) | 5.1.x | 8.7.1 | 6.0.x
+| 2024.0 | 5.3.xfootnote:oom[Out of maintenance] | 8.13.4 | 6.1.x
-| 2022.0 (Turing) | 5.0.xfootnote:oom[Out of maintenance] | 8.5.3 | 6.0.x
+| 2023.1 (Vaughan) | 5.2.xfootnote:oom[] | 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
 | 2021.1 (Q) | 4.3.xfootnote:oom[] | 7.15.2 | 5.3.x
 | 2021.0 (Pascal) | 4.2.xfootnote:oom[] | 7.12.0 | 5.3.x

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

@@ -0,0 +1,30 @@
+[[elasticsearch-migration-guide-5.4-5.5]]
+= Upgrading from 5.4.x to 5.5.x
+
+This section describes breaking changes from version 5.4.x to 5.5.x and how removed features can be replaced by new introduced features.
+
+[[elasticsearch-migration-guide-5.4-5.5.breaking-changes]]
+== Breaking Changes
+
+[[elasticsearch-migration-guide-5.4-5.5.deprecations]]
+== Deprecations
+
+Some classes that probably are not used by a library user have been renamed, the classes with the old names are still there, but are deprecated:
+
+|===
+|old name|new name
+
+|ElasticsearchPartQuery|RepositoryPartQuery
+|ElasticsearchStringQuery|RepositoryStringQuery
+|ReactiveElasticsearchStringQuery|ReactiveRepositoryStringQuery
+|===
+
+=== 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

@@ -0,0 +1,25 @@
+[[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/BulkFailureException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2020-2024 the original author or authors.
+ * Copyright 2020-2025 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.

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 the original author or authors.
+ * Copyright 2022-2025 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.
@@ -15,10 +15,10 @@
  */
 package org.springframework.data.elasticsearch;
 
-import org.springframework.lang.Nullable;
-
 import java.util.List;
 
+import org.jspecify.annotations.Nullable;
+
 /**
  * Object describing an Elasticsearch error
  *
@@ -26,8 +26,7 @@ import java.util.List;
  * @since 4.4
  */
 public class ElasticsearchErrorCause {
-	@Nullable
+	@Nullable private final String type;
-	private final String type;
 
 	private final String reason;
 

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2019-2024 the original author or authors.
+ * Copyright 2019-2025 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.

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2024 the original author or authors.
+ * 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.

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 the original author or authors.
+ * Copyright 2022-2025 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.

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2024 the original author or authors.
+ * 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.

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2020-2024 the original author or authors.
+ * Copyright 2020-2025 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.
@@ -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/VersionConflictException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2023-2024 the original author or authors.
+ * Copyright 2023-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/Alias.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2024 the original author or authors.
+ * Copyright 2024-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/Aliases.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2024 the original author or authors.
+ * Copyright 2024-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/CompletionContext.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2019-2024 the original author or authors.
+ * Copyright 2019-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/CompletionField.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2024 the original author or authors.
+ * Copyright 2013-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/CountQuery.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2024 the original author or authors.
+ * 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.

src/main/java/org/springframework/data/elasticsearch/annotations/DateFormat.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2024 the original author or authors.
+ * Copyright 2014-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/Document.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2024 the original author or authors.
+ * Copyright 2013-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/Dynamic.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2024 the original author or authors.
+ * 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.

src/main/java/org/springframework/data/elasticsearch/annotations/Field.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2024 the original author or authors.
+ * Copyright 2013-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/FieldElementType.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2024 the original author or authors.
+ * Copyright 2024-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/FieldType.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2024 the original author or authors.
+ * Copyright 2013-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/Filter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2024 the original author or authors.
+ * Copyright 2024-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/GeoPointField.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2024 the original author or authors.
+ * Copyright 2013-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/GeoShapeField.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2024 the original author or authors.
+ * Copyright 2017-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/Highlight.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2020-2024 the original author or authors.
+ * Copyright 2020-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/HighlightField.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2020-2024 the original author or authors.
+ * Copyright 2020-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/HighlightParameters.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2020-2024 the original author or authors.
+ * Copyright 2020-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/IndexOptions.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2019-2024 the original author or authors.
+ * Copyright 2019-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/IndexPrefixes.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2019-2024 the original author or authors.
+ * Copyright 2019-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/IndexedIndexName.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2023-2024 the original author or authors.
+ * Copyright 2023-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/InnerField.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2024 the original author or authors.
+ * Copyright 2014-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/JoinTypeRelation.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2020-2024 the original author or authors.
+ * Copyright 2020-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/JoinTypeRelations.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2020-2024 the original author or authors.
+ * Copyright 2020-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/KnnAlgorithmType.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2024 the original author or authors.
+ * Copyright 2024-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/KnnIndexOptions.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2024 the original author or authors.
+ * Copyright 2024-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/KnnSimilarity.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2024 the original author or authors.
+ * Copyright 2024-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/Mapping.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2024 the original author or authors.
+ * Copyright 2014-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/MappingAlias.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2024 the original author or authors.
+ * Copyright 2024-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/MultiField.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2024 the original author or authors.
+ * Copyright 2014-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/NullValueType.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2020-2024 the original author or authors.
+ * Copyright 2020-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/Query.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2024 the original author or authors.
+ * Copyright 2013-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/SearchTemplateQuery.java

@@ -0,0 +1,42 @@
+/*
+ * 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.
+ */
+package org.springframework.data.elasticsearch.annotations;
+
+import org.springframework.data.annotation.QueryAnnotation;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Annotation to mark a repository method as a search template method. The annotation defines the search template id,
+ * the parameters for the search template are taken from the method's arguments.
+ *
+ * @author P.J. Meisch (pj.meisch@sothawo.com)
+ * @since 5.5
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ ElementType.METHOD, ElementType.ANNOTATION_TYPE })
+@Documented
+@QueryAnnotation
+public @interface SearchTemplateQuery {
+    /**
+     * The id of the search template. Must not be empt or null.
+     */
+    String id();
+}

src/main/java/org/springframework/data/elasticsearch/annotations/Setting.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2024 the original author or authors.
+ * Copyright 2014-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/Similarity.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2019-2024 the original author or authors.
+ * Copyright 2019-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/SourceFilters.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 the original author or authors.
+ * Copyright 2022-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/TermVector.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2019-2024 the original author or authors.
+ * Copyright 2019-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/ValueConverter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2024 the original author or authors.
+ * 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.

src/main/java/org/springframework/data/elasticsearch/annotations/WriteOnlyProperty.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 the original author or authors.
+ * Copyright 2022-2025 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.

src/main/java/org/springframework/data/elasticsearch/annotations/WriteTypeHint.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2024 the original author or authors.
+ * 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.

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

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

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2023-2024 the original author or authors.
+ * Copyright 2023-2025 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.

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2023-2024 the original author or authors.
+ * Copyright 2023-2025 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.
@@ -19,6 +19,7 @@ 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;
@@ -32,7 +33,6 @@ 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

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

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2024 the original author or authors.
+ * Copyright 2018-2025 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.
@@ -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.
@@ -127,10 +127,16 @@ public interface ClientConfiguration {
 	Optional<String> getCaFingerprint();
 
 	/**
-	 * Returns the {@link HostnameVerifier} to use. Can be {@link Optional#empty()} if not configured.
+	 * Returns the {@link HostnameVerifier} to use. Must 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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2024 the original author or authors.
+ * Copyright 2018-2025 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.
@@ -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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2024 the original author or authors.
+ * Copyright 2018-2025 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.
@@ -24,9 +24,8 @@ import java.util.function.Supplier;
 import javax.net.ssl.HostnameVerifier;
 import javax.net.ssl.SSLContext;
 
-import org.elasticsearch.client.RestClientBuilder.HttpClientConfigCallback;
+import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.support.HttpHeaders;
-import org.springframework.lang.Nullable;
 
 /**
  * Default {@link ClientConfiguration} implementation.

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2024 the original author or authors.
+ * Copyright 2018-2025 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.

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2024 the original author or authors.
+ * Copyright 2018-2025 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.

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2024 the original author or authors.
+ * Copyright 2018-2025 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.

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 the original author or authors.
+ * Copyright 2022-2025 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.

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 the original author or authors.
+ * Copyright 2022-2025 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.

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2024 the original author or authors.
+ * Copyright 2024-2025 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.
@@ -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.Query getEsQuery(@Nullable Query query,
+	static co.elastic.clients.elasticsearch._types.query_dsl.@Nullable Query getEsQuery(@Nullable Query query,
 			@Nullable Consumer<Query> queryConverter) {
 		if (query == null) {
 			return null;

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 the original author or authors.
+ * Copyright 2022-2025 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.

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2024 the original author or authors.
+ * 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.
@@ -18,6 +18,8 @@ package org.springframework.data.elasticsearch.client.elc;
 import co.elastic.clients.elasticsearch.ElasticsearchClient;
 import co.elastic.clients.transport.ElasticsearchTransport;
 
+import java.io.IOException;
+
 import org.elasticsearch.client.RestClient;
 import org.springframework.util.Assert;
 
@@ -36,7 +38,10 @@ public class AutoCloseableElasticsearchClient extends ElasticsearchClient implem
 	}
 
 	@Override
-	public void close() throws Exception {
+	public void close() throws IOException {
-		transport.close();
+		// since Elasticsearch 8.16 the ElasticsearchClient implements (through ApiClient) the Closeable interface and
+		// handles closing of the underlying transport. We now just call the base class, but keep this as we
+		// have been implementing AutoCloseable since 4.4 and won't change that to a mere Closeable
+		super.close();
 	}
 }

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2024 the original author or authors.
+ * 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.

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2024 the original author or authors.
+ * 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.

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2024 the original author or authors.
+ * 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.

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2024 the original author or authors.
+ * 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.

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2024 the original author or authors.
+ * 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.
@@ -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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2024 the original author or authors.
+ * 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.
@@ -24,16 +24,9 @@ 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 java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.List;
-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.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;
@@ -41,9 +34,15 @@ 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;
 
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
 /**
  * Utility class to adapt different Elasticsearch responses to a
  * {@link org.springframework.data.elasticsearch.core.document.Document}
@@ -57,7 +56,8 @@ 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());
 
-		List<String> matchedQueries = hit.matchedQueries();
+        Map<String, Double> 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(@Nullable co.elastic.clients.elasticsearch.core.explain.Explanation explanation) {
+    private static Explanation from(co.elastic.clients.elasticsearch.core.explain.@Nullable Explanation explanation) {
 
         if (explanation == null) {
             return null;

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 the original author or authors.
+ * Copyright 2022-2025 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.

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2024 the original author or authors.
+ * 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.
@@ -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/ElasticsearchClientBeanDefinitionParser.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 the original author or authors.
+ * Copyright 2022-2025 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.

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 the original author or authors.
+ * Copyright 2022-2025 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.
@@ -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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2024 the original author or authors.
+ * 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.
@@ -15,44 +15,38 @@
  */
 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.elasticsearch.client.RestClientBuilder;
+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.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**
- * Utility class to create the different Elasticsearch clients
+ * Utility class to create the different Elasticsearch clients. The RestClient class is the one used in Elasticsearch
+ * 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
@@ -119,18 +113,32 @@ 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) {
 
@@ -139,6 +147,21 @@ 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}.
@@ -156,17 +179,21 @@ public final class ElasticsearchClients {
 
 	// region imperative client
 	/**
-	 * Creates a new imperative {@link ElasticsearchClient}
+	 * Creates a new imperative {@link ElasticsearchClient}. This uses a RestClient, if the old RestClient is needed, this
+	 * 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(getRestClient(clientConfiguration), null, DEFAULT_JSONP_MAPPER);
+		return createImperative(getRest5Client(clientConfiguration), null, DEFAULT_JSONP_MAPPER);
 	}
 
 	/**
-	 * Creates a new imperative {@link ElasticsearchClient}
+	 * Creates a new imperative {@link ElasticsearchClient}. This uses a RestClient, if the old RestClient is needed, this
+	 * 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.
@@ -174,7 +201,7 @@ public final class ElasticsearchClients {
 	 */
 	public static ElasticsearchClient createImperative(ClientConfiguration clientConfiguration,
 			TransportOptions transportOptions) {
-		return createImperative(getRestClient(clientConfiguration), transportOptions, DEFAULT_JSONP_MAPPER);
+		return createImperative(getRest5Client(clientConfiguration), transportOptions, DEFAULT_JSONP_MAPPER);
 	}
 
 	/**
@@ -182,11 +209,23 @@ 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}
 	 *
@@ -194,7 +233,9 @@ 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) {
 
@@ -206,6 +247,27 @@ 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}.
 	 *
@@ -220,96 +282,6 @@ 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
@@ -320,7 +292,9 @@ 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) {
 
@@ -329,7 +303,7 @@ public final class ElasticsearchClients {
 		Assert.notNull(jsonpMapper, "jsonpMapper must not be null");
 
 		TransportOptions.Builder transportOptionsBuilder = transportOptions != null ? transportOptions.toBuilder()
-				: new RestClientOptions(RequestOptions.DEFAULT).toBuilder();
+				: new RestClientOptions(org.elasticsearch.client.RequestOptions.DEFAULT, false).toBuilder();
 
 		RestClientOptions.Builder restClientOptionsBuilder = getRestClientOptionsBuilder(transportOptions);
 
@@ -353,70 +327,35 @@ 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
 
-	private static List<String> formattedHosts(List<InetSocketAddress> hosts, boolean useSsl) {
+	// todo #3117 remove and document that ElasticsearchHttpClientConfigurationCallback has been move to RestClients.
-		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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2024 the original author or authors.
+ * 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.
@@ -20,12 +20,13 @@ 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 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 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;
@@ -38,7 +39,9 @@ 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.
+ * classes must provide the {@link ClientConfiguration} to use. From Version 6.0 on, this class uses the new Rest5Client
+ * from Elasticsearch 9. The old implementation using the RestClient is still available under the name
+ * {@link ElasticsearchLegacyRestClientConfiguration}.
  *
  * @author Peter-Josef Meisch
  * @since 4.4
@@ -60,27 +63,27 @@ public abstract class ElasticsearchConfiguration extends ElasticsearchConfigurat
 	 * @return RestClient
 	 */
 	@Bean
-	public RestClient elasticsearchRestClient(ClientConfiguration clientConfiguration) {
+	public Rest5Client elasticsearchRest5Client(ClientConfiguration clientConfiguration) {
 
 		Assert.notNull(clientConfiguration, "clientConfiguration must not be null");
 
-		return ElasticsearchClients.getRestClient(clientConfiguration);
+		return Rest5Clients.getRest5Client(clientConfiguration);
 	}
 
 	/**
-	 * Provides the Elasticsearch transport to be used. The default implementation uses the {@link RestClient} bean and
+	 * Provides the Elasticsearch transport to be used. The default implementation uses the {@link Rest5Client} 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) {
+	public ElasticsearchTransport elasticsearchTransport(Rest5Client rest5Client, JsonpMapper jsonpMapper) {
 
-		Assert.notNull(restClient, "restClient must not be null");
+		Assert.notNull(rest5Client, "restClient must not be null");
 		Assert.notNull(jsonpMapper, "jsonpMapper must not be null");
 
-		return ElasticsearchClients.getElasticsearchTransport(restClient, ElasticsearchClients.IMPERATIVE_CLIENT,
+		return ElasticsearchClients.getElasticsearchTransport(rest5Client, ElasticsearchClients.IMPERATIVE_CLIENT,
 				transportOptions(), jsonpMapper);
 	}
 
@@ -115,7 +118,7 @@ public abstract class ElasticsearchConfiguration extends ElasticsearchConfigurat
 	}
 
 	/**
-	 * Provides the JsonpMapper bean that is used in the {@link #elasticsearchTransport(RestClient, JsonpMapper)} method.
+	 * Provides the JsonpMapper bean that is used in the {@link #elasticsearchTransport(Rest5Client, JsonpMapper)} method.
 	 *
 	 * @return the {@link JsonpMapper} to use
 	 * @since 5.2
@@ -135,6 +138,6 @@ 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 RestClientOptions(RequestOptions.DEFAULT);
+		return new Rest5ClientOptions(RequestOptions.DEFAULT, false);
 	}
 }

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2024 the original author or authors.
+ * 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.
@@ -119,14 +119,19 @@ 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("type\":\"version_conflict_engine_exception"))
+			if (status == 409 && message.contains("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

@@ -0,0 +1,144 @@
+/*
+ * 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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2024 the original author or authors.
+ * 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.
@@ -40,6 +40,7 @@ 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;
@@ -59,7 +60,6 @@ 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;
 
 /**
@@ -181,19 +181,6 @@ 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/EntityAsMap.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2024 the original author or authors.
+ * 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.

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 the original author or authors.
+ * Copyright 2022-2025 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.
@@ -20,6 +20,7 @@ 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;
@@ -27,7 +28,6 @@ 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;
 
 /**
@@ -43,7 +43,8 @@ class HighlightQueryBuilder {
 	private final RequestConverter requestConverter;
 
 	HighlightQueryBuilder(
-			MappingContext<? extends ElasticsearchPersistentEntity<?>, ElasticsearchPersistentProperty> mappingContext, RequestConverter requestConverter) {
+			MappingContext<? extends ElasticsearchPersistentEntity<?>, ElasticsearchPersistentProperty> mappingContext,
+			RequestConverter requestConverter) {
 		this.mappingContext = mappingContext;
 		this.requestConverter = requestConverter;
 	}

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2024 the original author or authors.
+ * 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.
@@ -27,6 +27,7 @@ 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;
@@ -49,7 +50,6 @@ 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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2024 the original author or authors.
+ * 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.
@@ -23,7 +23,7 @@ import java.nio.charset.StandardCharsets;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /**
  * @author Peter-Josef Meisch
@@ -48,7 +48,7 @@ final class JsonUtils {
 	}
 
 	@Nullable
-	public static String queryToJson(@Nullable co.elastic.clients.elasticsearch._types.query_dsl.Query query,
+	public static String queryToJson(co.elastic.clients.elasticsearch._types.query_dsl.@Nullable Query query,
 			JsonpMapper mapper) {
 
 		if (query == null) {

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2024 the original author or authors.
+ * 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.
@@ -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;
-	@Nullable private org.springframework.data.elasticsearch.core.query.Query springDataQuery;
+	private org.springframework.data.elasticsearch.core.query.@Nullable 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(@Nullable org.springframework.data.elasticsearch.core.query.Query springDataQuery) {
+	public void setSpringDataQuery(org.springframework.data.elasticsearch.core.query.@Nullable Query springDataQuery) {
 		this.springDataQuery = springDataQuery;
 	}
 
@@ -129,8 +129,7 @@ public class NativeQuery extends BaseQuery {
 		return knnSearches;
 	}
 
-	@Nullable
+	public org.springframework.data.elasticsearch.core.query.@Nullable Query getSpringDataQuery() {
-	public org.springframework.data.elasticsearch.core.query.Query getSpringDataQuery() {
 		return springDataQuery;
 	}
 }

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 the original author or authors.
+ * Copyright 2022-2025 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.
@@ -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<>();
 
-	@Nullable private org.springframework.data.elasticsearch.core.query.Query springDataQuery;
+	private org.springframework.data.elasticsearch.core.query.@Nullable Query springDataQuery;
 	@Nullable private KnnQuery knnQuery;
 	@Nullable private List<KnnSearch> knnSearches = Collections.emptyList();
 
@@ -104,8 +104,7 @@ public class NativeQueryBuilder extends BaseQueryBuilder<NativeQuery, NativeQuer
 		return knnSearches;
 	}
 
-	@Nullable
+	public org.springframework.data.elasticsearch.core.query.@Nullable Query getSpringDataQuery() {
-	public org.springframework.data.elasticsearch.core.query.Query getSpringDataQuery() {
 		return springDataQuery;
 	}