Polishing.

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

.mvn/jvm.config

@@ -8,3 +8,7 @@
 --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

.mvn/wrapper/maven-wrapper.properties

@@ -1,3 +1,3 @@
-#Thu Nov 07 09:49:32 CET 2024
+#Thu Nov 07 09:47:28 CET 2024
 wrapperUrl=https\://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar
 distributionUrl=https\://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.9/apache-maven-3.9.9-bin.zip

Jenkinsfile

@@ -9,7 +9,7 @@ pipeline {
 
 	triggers {
 		pollSCM 'H/10 * * * *'
-		upstream(upstreamProjects: "spring-data-commons/3.3.x", threshold: hudson.model.Result.SUCCESS)
+		upstream(upstreamProjects: "spring-data-commons/main", threshold: hudson.model.Result.SUCCESS)
 	}
 
 	options {

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

@@ -1,24 +1,20 @@
 # Java versions
-java.main.tag=17.0.13_11-jdk-focal
-java.next.tag=22.0.2_9-jdk-jammy
+java.main.tag=24.0.1_9-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.5.0.version=5.0.21
-docker.mongodb.6.0.version=6.0.10
-docker.mongodb.7.0.version=7.0.2
+docker.mongodb.6.0.version=6.0.23
+docker.mongodb.7.0.version=7.0.20
+docker.mongodb.8.0.version=8.0.9
 
 # 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>5.3.10</version>
+	<version>6.0.0-SNAPSHOT</version>
 
 	<parent>
 		<groupId>org.springframework.data.build</groupId>
 		<artifactId>spring-data-parent</artifactId>
-		<version>3.3.10</version>
+		<version>4.0.0-SNAPSHOT</version>
 	</parent>
 
 	<name>Spring Data Elasticsearch</name>
@@ -18,16 +18,16 @@
 	<url>https://github.com/spring-projects/spring-data-elasticsearch</url>
 
 	<properties>
-		<springdata.commons>3.3.10</springdata.commons>
+		<springdata.commons>4.0.0-SNAPSHOT</springdata.commons>
 
 		<!-- version of the ElasticsearchClient	-->
-		<elasticsearch-java>8.13.4</elasticsearch-java>
+		<elasticsearch-java>9.0.1</elasticsearch-java>
 
-		<hoverfly>0.14.4</hoverfly>
-		<log4j>2.18.0</log4j>
-		<jsonassert>1.5.1</jsonassert>
-		<testcontainers>1.18.0</testcontainers>
-		<wiremock>2.35.1</wiremock>
+		<hoverfly>0.19.0</hoverfly>
+		<log4j>2.23.1</log4j>
+		<jsonassert>1.5.3</jsonassert>
+		<testcontainers>1.20.0</testcontainers>
+		<wiremock>3.9.1</wiremock>
 
 		<java-module-name>spring.data.elasticsearch</java-module-name>
 
@@ -131,9 +131,10 @@
 				</exclusion>
 			</exclusions>
 		</dependency>
+
 		<dependency>
 			<groupId>org.elasticsearch.client</groupId>
-			<artifactId>elasticsearch-rest-client</artifactId> <!-- is Apache 2-->
+			<artifactId>elasticsearch-rest-client</artifactId>
 			<version>${elasticsearch-java}</version>
 			<exclusions>
 				<exclusion>
@@ -143,6 +144,13 @@
 			</exclusions>
 		</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>
@@ -255,8 +263,8 @@
 		</dependency>
 
 		<dependency>
-			<groupId>com.github.tomakehurst</groupId>
-			<artifactId>wiremock-jre8</artifactId>
+			<groupId>org.wiremock</groupId>
+			<artifactId>wiremock</artifactId>
 			<version>${wiremock}</version>
 			<scope>test</scope>
 			<exclusions>
@@ -461,8 +469,20 @@
 	</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

@@ -10,6 +10,10 @@
 *** xref:migration-guides/migration-guide-5.0-5.1.adoc[]
 *** 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[]
 ** xref:elasticsearch/clients.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/elasticsearch-new.adoc

@@ -1,10 +1,28 @@
 [[new-features]]
 = What's new
 
-[[new-features.5-3-1]]
-== New in Spring Data Elasticsearch 5.3.1
+[[new-features.6-0-0]]
+== New in Spring Data Elasticsearch 6.6
 
-* Upgrade to Elasticsearch 8.13.4.
+* Upgarde to Spring 7
+* Switch to jspecify nullability annotations
+* Upgrade to Elasticsearch 9.0.1
+
+
+[[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
+
+* Upgrade to Elasticsearch 8.15.3.
+* Allow to customize the mapped type name for `@InnerField` and `@Field` annotations.
+* Support for Elasticsearch SQL.
+* Add support for retrieving request executionDuration.
 
 [[new-features.5-3-0]]
 == New in Spring Data Elasticsearch 5.3

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/template.adoc

@@ -81,7 +81,7 @@ When a document is retrieved with the methods of the  `DocumentOperations` inter
 When searching with the methods of the `SearchOperations` interface, additional information is available for each entity, for example the _score_ or the _sortValues_ of the found entity.
 
 In order to return this information, each entity is wrapped in a `SearchHit` object that contains this entity-specific additional information.
-These `SearchHit` objects themselves are returned within a `SearchHits` object which additionally contains informations about the whole search like the _maxScore_ or requested aggregations.
+These `SearchHit` objects themselves are returned within a `SearchHits` object which additionally contains informations about the whole search like the _maxScore_ or requested aggregations or the execution duration it took to complete the request.
 The following classes and interfaces are now available:
 
 .SearchHit<T>

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

@@ -6,9 +6,12 @@ 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
-| 2024.0  | 5.3.3 | 8.13.4 | 6.1.x
-| 2023.1 (Vaughan) | 5.2.x | 8.11.1 | 6.1.x
-| 2023.0 (Ullmann) | 5.1.xfootnote:oom[Out of maintenance] | 8.7.1 | 6.0.x
+| 2025.1 (in development) | 6.0.x | 9.0.1 | 7.0.x
+| 2025.0 | 5.5.x | 8.18.1 | 6.2.x
+| 2024.1 | 5.4.x | 8.15.5 | 6.1.x
+| 2024.0 | 5.3.xfootnote:oom[Out of maintenance] | 8.13.4 | 6.1.x
+| 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

src/main/antora/modules/ROOT/pages/migration-guides/migration-guide-5.2-5.3.adoc

@@ -5,14 +5,17 @@ This section describes breaking changes from version 5.2.x to 5.3.x and how remo
 
 [[elasticsearch-migration-guide-5.2-5.3.breaking-changes]]
 == Breaking Changes
-During the parameter replacement in `@Query` annotated repository methods previous versions wrote the String _"null"_ into the query that was sent to Elasticsearch 
-when the actual parameter value was `null`. As Elasticsearch does not store `null` values, this behaviour could lead to problems, for example whent the fields to be 
-searched contains the string `"null"`. In Version 5.3 a `null` value in a parameter will cause a `ConversionException` to be thrown. If you are using `"null"` as the 
+
+During the parameter replacement in `@Query` annotated repository methods previous versions wrote the String `"null"` into the query that was sent to Elasticsearch when the actual parameter value was `null`.
+As Elasticsearch does not store `null` values, this behaviour could lead to problems, for example whent the fields to be searched contains the string `"null"`.
+In Version 5.3 a `null` value in a parameter will cause a `ConversionException` to be thrown.
+If you are using `"null"` as the
 `null_value` defined in a field mapping, then pass that string into the query instead of a Java `null`.
 
 [[elasticsearch-migration-guide-5.2-5.3.deprecations]]
 == Deprecations
 
 === Removals
+
 The deprecated classes `org.springframework.data.elasticsearch.ELCQueries`
- and `org.springframework.data.elasticsearch.client.elc.QueryBuilders` have been removed, use `org.springframework.data.elasticsearch.client.elc.Queries` instead.
+and `org.springframework.data.elasticsearch.client.elc.QueryBuilders` have been removed, use `org.springframework.data.elasticsearch.client.elc.Queries` instead.

src/main/antora/modules/ROOT/pages/migration-guides/migration-guide-5.3-5.4.adoc

@@ -0,0 +1,23 @@
+[[elasticsearch-migration-guide-5.3-5.4]]
+= Upgrading from 5.3.x to 5.4.x
+
+This section describes breaking changes from version 5.3.x to 5.4.x and how removed features can be replaced by new introduced features.
+
+[[elasticsearch-migration-guide-5.3-5.4.breaking-changes]]
+== Breaking Changes
+
+[[elasticsearch-migration-guide-5.3-5.4.breaking-changes.knn-search]]
+=== knn search
+The `withKnnQuery` method in `NativeQueryBuilder` has been replaced with `withKnnSearches` to build a `NativeQuery` with knn search.
+
+`KnnQuery` and `KnnSearch` are two different classes in elasticsearch java client and are used for different queries, with different parameters supported:
+
+- `KnnSearch`: is https://www.elastic.co/guide/en/elasticsearch/reference/8.13/search-search.html#search-api-knn[the top level `knn` query] in the elasticsearch request;
+- `KnnQuery`: is https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-knn-query.html[the `knn` query inside `query` clause];
+
+If `KnnQuery` is still preferable, please be sure to construct it inside `query` clause manually, by means of `withQuery(co.elastic.clients.elasticsearch._types.query_dsl.Query query)` clause in `NativeQueryBuilder`.
+
+[[elasticsearch-migration-guide-5.3-5.4.deprecations]]
+== Deprecations
+
+=== Removals

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 +1,21 @@
+[[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
+
+[[elasticsearch-migration-guide-5.5-6.0.deprecations]]
+== Deprecations
+
+
+=== Removals
+
+The `org.springframework.data.elasticsearch.core.query.ScriptType` enum has been removed. To distinguish between an inline and a stored script set the appropriate values in the `org.springframework.data.elasticsearch.core.query.ScriptData` record.
+
+These methods have been removed because the Elasticsearch Client 9 does not support them anymore:
+```
+org.springframework.data.elasticsearch.client.elc.ReactiveElasticsearchIndicesClient.unfreeze(UnfreezeRequest)
+org.springframework.data.elasticsearch.client.elc.ReactiveElasticsearchIndicesClient.unfreeze(Function<UnfreezeRequest.Builder, ObjectBuilder<UnfreezeRequest>>)
+```

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

@@ -15,10 +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
-	private final String type;
+	@Nullable private final String type;
 
 	private final String reason;
 

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

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

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

@@ -0,0 +1,79 @@
+/*
+ * 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.
+ * 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 java.lang.annotation.ElementType;
+import java.lang.annotation.Inherited;
+import java.lang.annotation.Repeatable;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.springframework.core.annotation.AliasFor;
+
+/**
+ * Identifies an alias for the index.
+ *
+ * @author Youssef Aouichaoui
+ * @since 5.4
+ */
+@Inherited
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ ElementType.TYPE })
+@Repeatable(Aliases.class)
+public @interface Alias {
+	/**
+	 * @return Index alias name. Alias for {@link #alias}.
+	 */
+	@AliasFor("alias")
+	String value() default "";
+
+	/**
+	 * @return Index alias name. Alias for {@link #value}.
+	 */
+	@AliasFor("value")
+	String alias() default "";
+
+	/**
+	 * @return Query used to limit documents the alias can access.
+	 */
+	Filter filter() default @Filter;
+
+	/**
+	 * @return Used to route indexing operations to a specific shard.
+	 */
+	String indexRouting() default "";
+
+	/**
+	 * @return Used to route indexing and search operations to a specific shard.
+	 */
+	String routing() default "";
+
+	/**
+	 * @return Used to route search operations to a specific shard.
+	 */
+	String searchRouting() default "";
+
+	/**
+	 * @return Is the alias hidden?
+	 */
+	boolean isHidden() default false;
+
+	/**
+	 * @return Is it the 'write index' for the alias?
+	 */
+	boolean isWriteIndex() default false;
+}

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

@@ -0,0 +1,36 @@
+/*
+ * 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.
+ * 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 java.lang.annotation.ElementType;
+import java.lang.annotation.Inherited;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Container annotation that aggregates several {@link Alias} annotations.
+ *
+ * @author Youssef Aouichaoui
+ * @see Alias
+ * @since 5.4
+ */
+@Inherited
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ ElementType.TYPE })
+public @interface Aliases {
+	Alias[] value();
+}

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

@@ -100,6 +100,13 @@ public @interface Document {
 	 */
 	boolean storeVersionInSource() default true;
 
+	/**
+	 * Aliases for the index.
+	 *
+	 * @since 5.4
+	 */
+	Alias[] aliases() default {};
+
 	/**
 	 * @since 4.3
 	 */

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

@@ -37,6 +37,8 @@ import org.springframework.core.annotation.AliasFor;
  * @author Brian Kimmig
  * @author Morgan Lutz
  * @author Sascha Woo
+ * @author Haibo Liu
+ * @author Andriy Redko
  */
 @Retention(RetentionPolicy.RUNTIME)
 @Target({ ElementType.FIELD, ElementType.ANNOTATION_TYPE, ElementType.METHOD })
@@ -128,6 +130,10 @@ public @interface Field {
 	boolean norms() default true;
 
 	/**
+	 * NOte that null_value setting are not supported in Elasticsearch for all types. For example setting a null_value on
+	 * a field with type text will throw an exception in the server when the mapping is written to Elasticsearch. Alas,
+	 * the Elasticsearch documentation does not specify on which types it is allowed on which it is not.
+	 *
 	 * @since 4.0
 	 */
 	String nullValue() default "";
@@ -195,6 +201,27 @@ public @interface Field {
 	 */
 	int dims() default -1;
 
+	/**
+	 * to be used in combination with {@link FieldType#Dense_Vector}
+	 *
+	 * @since 5.4
+	 */
+	String elementType() default FieldElementType.DEFAULT;
+
+	/**
+	 * to be used in combination with {@link FieldType#Dense_Vector}
+	 *
+	 * @since 5.4
+	 */
+	KnnSimilarity knnSimilarity() default KnnSimilarity.DEFAULT;
+
+	/**
+	 * to be used in combination with {@link FieldType#Dense_Vector}
+	 *
+	 * @since 5.4
+	 */
+	KnnIndexOptions[] knnIndexOptions() default {};
+
 	/**
 	 * Controls how Elasticsearch dynamically adds fields to the inner object within the document.<br>
 	 * To be used in combination with {@link FieldType#Object} or {@link FieldType#Nested}
@@ -218,4 +245,11 @@ public @interface Field {
 	 * @since 5.1
 	 */
 	boolean storeEmptyValue() default true;
+
+	/**
+	 * overrides the field type in the mapping which otherwise will be taken from corresponding {@link FieldType}
+	 *
+	 * @since 5.4
+	 */
+	String mappedTypeName() default "";
 }

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

@@ -0,0 +1,26 @@
+/*
+ * 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.
+ * 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;
+
+/**
+ * @author Haibo Liu
+ * @since 5.4
+ */
+public final class FieldElementType {
+	public final static String DEFAULT = "";
+	public final static String FLOAT = "float";
+	public final static String BYTE = "byte";
+}

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

@@ -0,0 +1,38 @@
+/*
+ * 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.
+ * 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.core.annotation.AliasFor;
+
+/**
+ * Query used to limit documents.
+ *
+ * @author Youssef Aouichaoui
+ * @since 5.4
+ */
+public @interface Filter {
+	/**
+	 * @return Query used to limit documents. Alias for {@link #query}.
+	 */
+	@AliasFor("query")
+	String value() default "";
+
+	/**
+	 * @return Query used to limit documents. Alias for {@link #value}.
+	 */
+	@AliasFor("value")
+	String query() default "";
+}

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

@@ -29,6 +29,8 @@ import java.lang.annotation.Target;
  * @author Aleksei Arsenev
  * @author Brian Kimmig
  * @author Morgan Lutz
+ * @author Haibo Liu
+ * @author Andriy Redko
  */
 @Retention(RetentionPolicy.RUNTIME)
 @Target(ElementType.ANNOTATION_TYPE)
@@ -149,4 +151,32 @@ public @interface InnerField {
 	 * @since 4.2
 	 */
 	int dims() default -1;
+
+	/**
+	 * to be used in combination with {@link FieldType#Dense_Vector}
+	 *
+	 * @since 5.4
+	 */
+	String elementType() default FieldElementType.DEFAULT;
+
+	/**
+	 * to be used in combination with {@link FieldType#Dense_Vector}
+	 *
+	 * @since 5.4
+	 */
+	KnnSimilarity knnSimilarity() default KnnSimilarity.DEFAULT;
+
+	/**
+	 * to be used in combination with {@link FieldType#Dense_Vector}
+	 *
+	 * @since 5.4
+	 */
+	KnnIndexOptions[] knnIndexOptions() default {};
+
+	/**
+	 * overrides the field type in the mapping which otherwise will be taken from corresponding {@link FieldType}
+	 *
+	 * @since 5.4
+	 */
+	String mappedTypeName() default "";
 }

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

@@ -0,0 +1,38 @@
+/*
+ * 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.
+ * 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;
+
+/**
+ * @author Haibo Liu
+ * @since 5.4
+ */
+public enum KnnAlgorithmType {
+	HNSW("hnsw"),
+	INT8_HNSW("int8_hnsw"),
+	FLAT("flat"),
+	INT8_FLAT("int8_flat"),
+	DEFAULT("");
+
+	private final String type;
+
+	KnnAlgorithmType(String type) {
+		this.type = type;
+	}
+
+	public String getType() {
+		return type;
+	}
+}

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

@@ -0,0 +1,40 @@
+/*
+ * 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.
+ * 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;
+
+/**
+ * @author Haibo Liu
+ * @since 5.4
+ */
+public @interface KnnIndexOptions {
+
+	KnnAlgorithmType type() default KnnAlgorithmType.DEFAULT;
+
+	/**
+	 * Only applicable to {@link KnnAlgorithmType#HNSW} and {@link KnnAlgorithmType#INT8_HNSW} index types.
+	 */
+	int m() default -1;
+
+	/**
+	 * Only applicable to {@link KnnAlgorithmType#HNSW} and {@link KnnAlgorithmType#INT8_HNSW} index types.
+	 */
+	int efConstruction() default -1;
+
+	/**
+	 * Only applicable to {@link KnnAlgorithmType#INT8_HNSW} and {@link KnnAlgorithmType#INT8_FLAT} index types.
+	 */
+	float confidenceInterval() default -1F;
+}

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

@@ -0,0 +1,38 @@
+/*
+ * 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.
+ * 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;
+
+/**
+ * @author Haibo Liu
+ * @since 5.4
+ */
+public enum KnnSimilarity {
+	L2_NORM("l2_norm"),
+	DOT_PRODUCT("dot_product"),
+	COSINE("cosine"),
+	MAX_INNER_PRODUCT("max_inner_product"),
+	DEFAULT("");
+
+	private final String similarity;
+
+	KnnSimilarity(String similarity) {
+		this.similarity = similarity;
+	}
+
+	public String getSimilarity() {
+		return similarity;
+	}
+}

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/package-info.java

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

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

@@ -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.springframework.lang.NonNullFields
+@org.jspecify.annotations.NullMarked
 package org.springframework.data.elasticsearch.aot;

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

@@ -25,8 +25,8 @@ import java.util.function.Supplier;
 import javax.net.ssl.HostnameVerifier;
 import javax.net.ssl.SSLContext;
 
+import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.support.HttpHeaders;
-import org.springframework.lang.Nullable;
 
 /**
  * Configuration interface exposing common client configuration properties for Elasticsearch clients.

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

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

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

@@ -24,9 +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/elc/AbstractQueryProcessor.java

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

@@ -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 {
-		transport.close();
+	public void close() throws IOException {
+		// 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/CriteriaQueryProcessor.java

@@ -31,13 +31,13 @@ import java.util.Iterator;
 import java.util.List;
 import java.util.Objects;
 
+import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.annotations.FieldType;
 import org.springframework.data.elasticsearch.core.query.Criteria;
 import org.springframework.data.elasticsearch.core.query.Field;
 import org.springframework.data.elasticsearch.core.query.HasChildQuery;
 import org.springframework.data.elasticsearch.core.query.HasParentQuery;
 import org.springframework.data.elasticsearch.core.query.InnerHitsQuery;
-import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**
@@ -249,49 +249,54 @@ class CriteriaQueryProcessor extends AbstractQueryProcessor {
 				queryBuilder.queryString(queryStringQuery(fieldName, Objects.requireNonNull(value).toString(), boost));
 				break;
 			case LESS:
-				queryBuilder //
-						.range(rb -> rb //
-								.field(fieldName) //
-								.lt(JsonData.of(value)) //
-								.boost(boost)); //
+				queryBuilder
+						.range(rb -> rb
+								.untyped(ut -> ut
+										.field(fieldName)
+										.lt(JsonData.of(value))
+										.boost(boost)));
 				break;
 			case LESS_EQUAL:
-				queryBuilder //
-						.range(rb -> rb //
-								.field(fieldName) //
-								.lte(JsonData.of(value)) //
-								.boost(boost)); //
+				queryBuilder
+						.range(rb -> rb
+								.untyped(ut -> ut
+										.field(fieldName)
+										.lte(JsonData.of(value))
+										.boost(boost)));
 				break;
 			case GREATER:
-				queryBuilder //
-						.range(rb -> rb //
-								.field(fieldName) //
-								.gt(JsonData.of(value)) //
-								.boost(boost)); //
+				queryBuilder
+						.range(rb -> rb
+								.untyped(ut -> ut
+										.field(fieldName)
+										.gt(JsonData.of(value))
+										.boost(boost)));
 				break;
 			case GREATER_EQUAL:
-				queryBuilder //
-						.range(rb -> rb //
-								.field(fieldName) //
-								.gte(JsonData.of(value)) //
-								.boost(boost)); //
+				queryBuilder
+						.range(rb -> rb
+								.untyped(ut -> ut
+										.field(fieldName)
+										.gte(JsonData.of(value))
+										.boost(boost)));
 				break;
 			case BETWEEN:
 				Object[] ranges = (Object[]) value;
 				Assert.notNull(value, "value for a between condition must not be null");
-				queryBuilder //
-						.range(rb -> {
-							rb.field(fieldName);
+				queryBuilder
+						.range(rb -> rb
+								.untyped(ut -> {
+									ut.field(fieldName);
 									if (ranges[0] != null) {
-								rb.gte(JsonData.of(ranges[0]));
+										ut.gte(JsonData.of(ranges[0]));
 									}
 
 									if (ranges[1] != null) {
-								rb.lte(JsonData.of(ranges[1]));
+										ut.lte(JsonData.of(ranges[1]));
 									}
-							rb.boost(boost); //
-							return rb;
-						}); //
+									ut.boost(boost); //
+									return ut;
+								}));
 
 				break;
 			case FUZZY:

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

@@ -24,6 +24,17 @@ import co.elastic.clients.elasticsearch.core.search.Hit;
 import co.elastic.clients.elasticsearch.core.search.NestedIdentity;
 import co.elastic.clients.json.JsonData;
 import co.elastic.clients.json.JsonpMapper;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.jspecify.annotations.Nullable;
+import org.springframework.data.elasticsearch.core.MultiGetItem;
+import org.springframework.data.elasticsearch.core.document.Document;
+import org.springframework.data.elasticsearch.core.document.Explanation;
+import org.springframework.data.elasticsearch.core.document.NestedMetaData;
+import org.springframework.data.elasticsearch.core.document.SearchDocument;
+import org.springframework.data.elasticsearch.core.document.SearchDocumentAdapter;
+import org.springframework.data.elasticsearch.core.document.SearchDocumentResponse;
+import org.springframework.util.Assert;
 
 import java.util.Collections;
 import java.util.LinkedHashMap;
@@ -32,31 +43,21 @@ import java.util.Map;
 import java.util.function.Function;
 import java.util.stream.Collectors;
 
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
-import org.springframework.data.elasticsearch.core.MultiGetItem;
-import org.springframework.data.elasticsearch.core.document.Document;
-import org.springframework.data.elasticsearch.core.document.Explanation;
-import org.springframework.data.elasticsearch.core.document.NestedMetaData;
-import org.springframework.data.elasticsearch.core.document.SearchDocument;
-import org.springframework.data.elasticsearch.core.document.SearchDocumentAdapter;
-import org.springframework.data.elasticsearch.core.document.SearchDocumentResponse;
-import org.springframework.lang.Nullable;
-import org.springframework.util.Assert;
-
 /**
  * Utility class to adapt different Elasticsearch responses to a
  * {@link org.springframework.data.elasticsearch.core.document.Document}
  *
  * @author Peter-Josef Meisch
  * @author Haibo Liu
+ * @author Mohamed El Harrougui
  * @since 4.4
  */
 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.
@@ -74,7 +75,7 @@ final class DocumentAdapters {
         Map<String, SearchDocumentResponse> innerHits = new LinkedHashMap<>();
         hit.innerHits().forEach((name, innerHitsResult) -> {
             // noinspection ReturnOfNull
-			innerHits.put(name, SearchDocumentResponseBuilder.from(innerHitsResult.hits(), null, null, null, null, null,
+            innerHits.put(name, SearchDocumentResponseBuilder.from(innerHitsResult.hits(), null, null, null, 0, null, null,
                     searchDocument -> null, jsonpMapper));
         });
 
@@ -82,11 +83,11 @@ 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("{");
-			final boolean[] firstField = { true };
+            final boolean[] firstField = {true};
             hit.fields().forEach((key, jsonData) -> {
                 if (!firstField[0]) {
                     sb.append(',');
@@ -154,12 +155,12 @@ final class DocumentAdapters {
         }
 
         float score = completionSuggestOption.score() != null ? completionSuggestOption.score().floatValue() : Float.NaN;
-		return new SearchDocumentAdapter(document, score, new Object[] {}, Collections.emptyMap(), Collections.emptyMap(),
+        return new SearchDocumentAdapter(document, score, new Object[]{}, Collections.emptyMap(), Collections.emptyMap(),
                 Collections.emptyMap(), null, null, null, completionSuggestOption.routing());
     }
 
     @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/ElasticsearchAggregations.java

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

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

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

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

@@ -46,9 +46,9 @@ 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.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**
@@ -329,7 +329,7 @@ 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(RequestOptions.DEFAULT, false).toBuilder();
 
 		RestClientOptions.Builder restClientOptionsBuilder = getRestClientOptionsBuilder(transportOptions);
 

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

@@ -135,6 +135,6 @@ public abstract class ElasticsearchConfiguration extends ElasticsearchConfigurat
 	 * @return the options that should be added to every request. Must not be {@literal null}
 	 */
 	public TransportOptions transportOptions() {
-		return new RestClientOptions(RequestOptions.DEFAULT);
+		return new RestClientOptions(RequestOptions.DEFAULT, false);
 	}
 }

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

@@ -23,6 +23,8 @@ import co.elastic.clients.elasticsearch.core.*;
 import co.elastic.clients.elasticsearch.core.bulk.BulkResponseItem;
 import co.elastic.clients.elasticsearch.core.msearch.MultiSearchResponseItem;
 import co.elastic.clients.elasticsearch.core.search.ResponseBody;
+import co.elastic.clients.elasticsearch.sql.ElasticsearchSqlClient;
+import co.elastic.clients.elasticsearch.sql.QueryResponse;
 import co.elastic.clients.json.JsonpMapper;
 import co.elastic.clients.transport.Version;
 
@@ -38,6 +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;
@@ -56,7 +59,7 @@ import org.springframework.data.elasticsearch.core.query.UpdateResponse;
 import org.springframework.data.elasticsearch.core.reindex.ReindexRequest;
 import org.springframework.data.elasticsearch.core.reindex.ReindexResponse;
 import org.springframework.data.elasticsearch.core.script.Script;
-import org.springframework.lang.Nullable;
+import org.springframework.data.elasticsearch.core.sql.SqlResponse;
 import org.springframework.util.Assert;
 
 /**
@@ -74,6 +77,7 @@ public class ElasticsearchTemplate extends AbstractElasticsearchTemplate {
 	private static final Log LOGGER = LogFactory.getLog(ElasticsearchTemplate.class);
 
 	private final ElasticsearchClient client;
+	private final ElasticsearchSqlClient sqlClient;
 	private final RequestConverter requestConverter;
 	private final ResponseConverter responseConverter;
 	private final JsonpMapper jsonpMapper;
@@ -85,6 +89,7 @@ public class ElasticsearchTemplate extends AbstractElasticsearchTemplate {
 		Assert.notNull(client, "client must not be null");
 
 		this.client = client;
+		this.sqlClient = client.sql();
 		this.jsonpMapper = client._transport().jsonpMapper();
 		requestConverter = new RequestConverter(elasticsearchConverter, jsonpMapper);
 		responseConverter = new ResponseConverter(jsonpMapper);
@@ -97,6 +102,7 @@ public class ElasticsearchTemplate extends AbstractElasticsearchTemplate {
 		Assert.notNull(client, "client must not be null");
 
 		this.client = client;
+		this.sqlClient = client.sql();
 		this.jsonpMapper = client._transport().jsonpMapper();
 		requestConverter = new RequestConverter(elasticsearchConverter, jsonpMapper);
 		responseConverter = new ResponseConverter(jsonpMapper);
@@ -175,19 +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");
@@ -656,6 +649,19 @@ public class ElasticsearchTemplate extends AbstractElasticsearchTemplate {
 		DeleteScriptRequest request = requestConverter.scriptDelete(name);
 		return execute(client -> client.deleteScript(request)).acknowledged();
 	}
+
+	@Override
+	public SqlResponse search(SqlQuery query) {
+		Assert.notNull(query, "Query must not be null.");
+
+		try {
+			QueryResponse response = sqlClient.query(requestConverter.sqlQueryRequest(query));
+
+			return responseConverter.sqlResponse(response);
+		} catch (IOException e) {
+			throw exceptionTranslator.translateException(e);
+		}
+	}
 	// endregion
 
 	// region client callback

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

@@ -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

@@ -21,13 +21,13 @@ import co.elastic.clients.elasticsearch.indices.*;
 import co.elastic.clients.transport.ElasticsearchTransport;
 import co.elastic.clients.transport.endpoints.BooleanResponse;
 
+import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
 import java.util.Set;
 
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
+import org.jspecify.annotations.Nullable;
 import org.springframework.core.annotation.AnnotatedElementUtils;
 import org.springframework.dao.InvalidDataAccessApiUsageException;
 import org.springframework.data.elasticsearch.UncategorizedElasticsearchException;
@@ -46,9 +46,10 @@ import org.springframework.data.elasticsearch.core.index.GetIndexTemplateRequest
 import org.springframework.data.elasticsearch.core.index.GetTemplateRequest;
 import org.springframework.data.elasticsearch.core.index.PutIndexTemplateRequest;
 import org.springframework.data.elasticsearch.core.index.PutTemplateRequest;
+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;
 
 /**
@@ -60,8 +61,6 @@ import org.springframework.util.Assert;
 public class IndicesTemplate extends ChildTemplate<ElasticsearchTransport, ElasticsearchIndicesClient>
 		implements IndexOperations {
 
-	private static final Log LOGGER = LogFactory.getLog(IndicesTemplate.class);
-
 	// we need a cluster client as well because ES has put some methods from the indices API into the cluster client
 	// (component templates)
 	private final ClusterTemplate clusterTemplate;
@@ -137,11 +136,14 @@ public class IndicesTemplate extends ChildTemplate<ElasticsearchTransport, Elast
 
 	protected boolean doCreate(IndexCoordinates indexCoordinates, Map<String, Object> settings,
 			@Nullable Document mapping) {
+		Set<Alias> aliases = (boundClass != null) ? getAliasesFor(boundClass) : new HashSet<>();
+		CreateIndexSettings indexSettings = CreateIndexSettings.builder(indexCoordinates)
+				.withAliases(aliases)
+				.withSettings(settings)
+				.withMapping(mapping)
+				.build();
 
-		Assert.notNull(indexCoordinates, "indexCoordinates must not be null");
-		Assert.notNull(settings, "settings must not be null");
-
-		CreateIndexRequest createIndexRequest = requestConverter.indicesCreateRequest(indexCoordinates, settings, mapping);
+		CreateIndexRequest createIndexRequest = requestConverter.indicesCreateRequest(indexSettings);
 		CreateIndexResponse createIndexResponse = execute(client -> client.create(createIndexRequest));
 		return Boolean.TRUE.equals(createIndexResponse.acknowledged());
 	}
@@ -236,8 +238,7 @@ public class IndicesTemplate extends ChildTemplate<ElasticsearchTransport, Elast
 		GetMappingRequest getMappingRequest = requestConverter.indicesGetMappingRequest(indexCoordinates);
 		GetMappingResponse getMappingResponse = execute(client -> client.getMapping(getMappingRequest));
 
-		Document mappingResponse = responseConverter.indicesGetMapping(getMappingResponse, indexCoordinates);
-		return mappingResponse;
+		return responseConverter.indicesGetMapping(getMappingResponse, indexCoordinates);
 	}
 
 	@Override
@@ -449,5 +450,14 @@ public class IndicesTemplate extends ChildTemplate<ElasticsearchTransport, Elast
 	public IndexCoordinates getIndexCoordinatesFor(Class<?> clazz) {
 		return getRequiredPersistentEntity(clazz).getIndexCoordinates();
 	}
+
+	/**
+	 * Get the {@link Alias} of the provided class.
+	 *
+	 * @param clazz provided class that can be used to extract aliases.
+	 */
+	public Set<Alias> getAliasesFor(Class<?> clazz) {
+		return getRequiredPersistentEntity(clazz).getAliases();
+	}
 	// endregion
 }

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

@@ -23,7 +23,7 @@ import java.nio.charset.StandardCharsets;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-import org.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

@@ -15,7 +15,6 @@
  */
 package org.springframework.data.elasticsearch.client.elc;
 
-import co.elastic.clients.elasticsearch._types.KnnQuery;
 import co.elastic.clients.elasticsearch._types.KnnSearch;
 import co.elastic.clients.elasticsearch._types.SortOptions;
 import co.elastic.clients.elasticsearch._types.aggregations.Aggregation;
@@ -29,9 +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.data.elasticsearch.core.query.ScriptedField;
-import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**
@@ -40,12 +38,13 @@ import org.springframework.util.Assert;
  *
  * @author Peter-Josef Meisch
  * @author Sascha Woo
+ * @author Haibo Liu
  * @since 4.4
  */
 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<>();
@@ -54,7 +53,6 @@ public class NativeQuery extends BaseQuery {
 	private List<SortOptions> sortOptions = Collections.emptyList();
 
 	private Map<String, JsonData> searchExtensions = Collections.emptyMap();
-	@Nullable private KnnQuery knnQuery;
 	@Nullable private List<KnnSearch> knnSearches = Collections.emptyList();
 
 	public NativeQuery(NativeQueryBuilder builder) {
@@ -72,7 +70,6 @@ public class NativeQuery extends BaseQuery {
 					"Cannot add an NativeQuery in a NativeQuery");
 		}
 		this.springDataQuery = builder.getSpringDataQuery();
-		this.knnQuery = builder.getKnnQuery();
 		this.knnSearches = builder.getKnnSearches();
 	}
 
@@ -120,18 +117,10 @@ 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;
 	}
 
-	/**
-	 * @since 5.1
-	 */
-	@Nullable
-	public KnnQuery getKnnQuery() {
-		return knnQuery;
-	}
-
 	/**
 	 * @since 5.3.1
 	 */
@@ -140,8 +129,7 @@ public class NativeQuery extends BaseQuery {
 		return knnSearches;
 	}
 
-	@Nullable
-	public org.springframework.data.elasticsearch.core.query.Query getSpringDataQuery() {
+	public org.springframework.data.elasticsearch.core.query.@Nullable Query getSpringDataQuery() {
 		return springDataQuery;
 	}
 }

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

@@ -33,13 +33,14 @@ 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;
 
 /**
  * @author Peter-Josef Meisch
  * @author Sascha Woo
+ * @author Haibo Liu
  * @since 4.4
  */
 public class NativeQueryBuilder extends BaseQueryBuilder<NativeQuery, NativeQueryBuilder> {
@@ -52,7 +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();
 
@@ -103,8 +104,7 @@ public class NativeQueryBuilder extends BaseQueryBuilder<NativeQuery, NativeQuer
 		return knnSearches;
 	}
 
-	@Nullable
-	public org.springframework.data.elasticsearch.core.query.Query getSpringDataQuery() {
+	public org.springframework.data.elasticsearch.core.query.@Nullable Query getSpringDataQuery() {
 		return springDataQuery;
 	}
 
@@ -213,13 +213,30 @@ public class NativeQueryBuilder extends BaseQueryBuilder<NativeQuery, NativeQuer
 	}
 
 	/**
-	 * @since 5.1
+	 * @since 5.4
 	 */
-	public NativeQueryBuilder withKnnQuery(KnnQuery knnQuery) {
-		this.knnQuery = knnQuery;
+	public NativeQueryBuilder withKnnSearches(List<KnnSearch> knnSearches) {
+		this.knnSearches = knnSearches;
 		return this;
 	}
 
+	/**
+	 * @since 5.4
+	 */
+	public NativeQueryBuilder withKnnSearches(Function<KnnSearch.Builder, ObjectBuilder<KnnSearch>> fn) {
+
+		Assert.notNull(fn, "fn must not be null");
+
+		return withKnnSearches(fn.apply(new KnnSearch.Builder()).build());
+	}
+
+	/**
+	 * @since 5.4
+	 */
+	public NativeQueryBuilder withKnnSearches(KnnSearch knnSearch) {
+		return withKnnSearches(List.of(knnSearch));
+	}
+
 	public NativeQuery build() {
 		Assert.isTrue(query == null || springDataQuery == null, "Cannot have both a native query and a Spring Data query");
 		return new NativeQuery(this);

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

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

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

@@ -27,15 +27,17 @@ import co.elastic.clients.transport.endpoints.EndpointWithResponseMapperAttr;
 import co.elastic.clients.util.ObjectBuilder;
 import reactor.core.publisher.Mono;
 
+import java.io.IOException;
 import java.util.function.Function;
 
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.springframework.util.Assert;
 
 /**
  * Reactive version of {@link co.elastic.clients.elasticsearch.ElasticsearchClient}.
  *
  * @author Peter-Josef Meisch
+ * @author maryantocinn
  * @since 4.4
  */
 public class ReactiveElasticsearchClient extends ApiClient<ElasticsearchTransport, ReactiveElasticsearchClient>
@@ -55,8 +57,11 @@ public class ReactiveElasticsearchClient extends ApiClient<ElasticsearchTranspor
 	}
 
 	@Override
-	public void close() throws Exception {
-		transport.close();
+	public void close() throws IOException {
+		// 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();
 	}
 
 	// region child clients
@@ -69,6 +74,10 @@ public class ReactiveElasticsearchClient extends ApiClient<ElasticsearchTranspor
 		return new ReactiveElasticsearchIndicesClient(transport, transportOptions);
 	}
 
+	public ReactiveElasticsearchSqlClient sql() {
+		return new ReactiveElasticsearchSqlClient(transport, transportOptions);
+	}
+
 	// endregion
 	// region info
 
@@ -122,7 +131,8 @@ public class ReactiveElasticsearchClient extends ApiClient<ElasticsearchTranspor
 		// java.lang.Class<TDocument>)
 		// noinspection unchecked
 		JsonEndpoint<GetRequest, GetResponse<T>, ErrorResponse> endpoint = (JsonEndpoint<GetRequest, GetResponse<T>, ErrorResponse>) GetRequest._ENDPOINT;
-		endpoint = new EndpointWithResponseMapperAttr<>(endpoint, "co.elastic.clients:Deserializer:_global.get.TDocument",
+		endpoint = new EndpointWithResponseMapperAttr<>(endpoint,
+				"co.elastic.clients:Deserializer:_global.get.Response.TDocument",
 				getDeserializer(tClass));
 
 		return Mono.fromFuture(transport.performRequestAsync(request, endpoint, transportOptions));
@@ -141,7 +151,7 @@ public class ReactiveElasticsearchClient extends ApiClient<ElasticsearchTranspor
 
 		// noinspection unchecked
 		JsonEndpoint<UpdateRequest<?, ?>, UpdateResponse<T>, ErrorResponse> endpoint = new EndpointWithResponseMapperAttr(
-				UpdateRequest._ENDPOINT, "co.elastic.clients:Deserializer:_global.update.TDocument",
+				UpdateRequest._ENDPOINT, "co.elastic.clients:Deserializer:_global.update.Response.TDocument",
 				this.getDeserializer(clazz));
 		return Mono.fromFuture(transport.performRequestAsync(request, endpoint, this.transportOptions));
 	}
@@ -167,7 +177,8 @@ public class ReactiveElasticsearchClient extends ApiClient<ElasticsearchTranspor
 
 		// noinspection unchecked
 		JsonEndpoint<MgetRequest, MgetResponse<T>, ErrorResponse> endpoint = (JsonEndpoint<MgetRequest, MgetResponse<T>, ErrorResponse>) MgetRequest._ENDPOINT;
-		endpoint = new EndpointWithResponseMapperAttr<>(endpoint, "co.elastic.clients:Deserializer:_global.mget.TDocument",
+		endpoint = new EndpointWithResponseMapperAttr<>(endpoint,
+				"co.elastic.clients:Deserializer:_global.mget.Response.TDocument",
 				this.getDeserializer(clazz));
 
 		return Mono.fromFuture(transport.performRequestAsync(request, endpoint, transportOptions));
@@ -223,6 +234,26 @@ public class ReactiveElasticsearchClient extends ApiClient<ElasticsearchTranspor
 		return deleteByQuery(fn.apply(new DeleteByQueryRequest.Builder()).build());
 	}
 
+	/**
+	 * @since 5.4
+	 */
+	public Mono<CountResponse> count(CountRequest request) {
+
+		Assert.notNull(request, "request must not be null");
+
+		return Mono.fromFuture(transport.performRequestAsync(request, CountRequest._ENDPOINT, transportOptions));
+	}
+
+	/**
+	 * @since 5.4
+	 */
+	public Mono<CountResponse> count(Function<CountRequest.Builder, ObjectBuilder<CountRequest>> fn) {
+
+		Assert.notNull(fn, "fn must not be null");
+
+		return count(fn.apply(new CountRequest.Builder()).build());
+	}
+
 	// endregion
 	// region search
 
@@ -278,7 +309,7 @@ public class ReactiveElasticsearchClient extends ApiClient<ElasticsearchTranspor
 		// noinspection unchecked
 		JsonEndpoint<ScrollRequest, ScrollResponse<T>, ErrorResponse> endpoint = (JsonEndpoint<ScrollRequest, ScrollResponse<T>, ErrorResponse>) ScrollRequest._ENDPOINT;
 		endpoint = new EndpointWithResponseMapperAttr<>(endpoint,
-				"co.elastic.clients:Deserializer:_global.scroll.TDocument", getDeserializer(tDocumentClass));
+				"co.elastic.clients:Deserializer:_global.scroll.Response.TDocument", getDeserializer(tDocumentClass));
 
 		return Mono.fromFuture(transport.performRequestAsync(request, endpoint, transportOptions));
 	}

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

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

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

@@ -125,6 +125,6 @@ public abstract class ReactiveElasticsearchConfiguration extends ElasticsearchCo
 	 * @return the options that should be added to every request. Must not be {@literal null}
 	 */
 	public TransportOptions transportOptions() {
-		return new RestClientOptions(RequestOptions.DEFAULT).toBuilder().build();
+		return new RestClientOptions(RequestOptions.DEFAULT, false).toBuilder().build();
 	}
 }

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

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

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

@@ -0,0 +1,72 @@
+/*
+ * 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.
+ * 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.ApiClient;
+import co.elastic.clients.elasticsearch._types.ElasticsearchException;
+import co.elastic.clients.elasticsearch.sql.QueryRequest;
+import co.elastic.clients.elasticsearch.sql.QueryResponse;
+import co.elastic.clients.transport.ElasticsearchTransport;
+import co.elastic.clients.transport.TransportOptions;
+import co.elastic.clients.util.ObjectBuilder;
+import reactor.core.publisher.Mono;
+
+import java.io.IOException;
+import java.util.function.Function;
+
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Reactive version of {@link co.elastic.clients.elasticsearch.sql.ElasticsearchSqlClient}.
+ *
+ * @author Aouichaoui Youssef
+ * @since 5.4
+ */
+public class ReactiveElasticsearchSqlClient extends ApiClient<ElasticsearchTransport, ReactiveElasticsearchSqlClient> {
+	public ReactiveElasticsearchSqlClient(ElasticsearchTransport transport, @Nullable TransportOptions transportOptions) {
+		super(transport, transportOptions);
+	}
+
+	@Override
+	public ReactiveElasticsearchSqlClient withTransportOptions(@Nullable TransportOptions transportOptions) {
+		return new ReactiveElasticsearchSqlClient(transport, transportOptions);
+	}
+
+	/**
+	 * Executes a SQL request
+	 *
+	 * @param fn a function that initializes a builder to create the {@link QueryRequest}.
+	 */
+	public final Mono<QueryResponse> query(Function<QueryRequest.Builder, ObjectBuilder<QueryRequest>> fn)
+			throws IOException, ElasticsearchException {
+		return query(fn.apply(new QueryRequest.Builder()).build());
+	}
+
+	/**
+	 * Executes a SQL request.
+	 */
+	public Mono<QueryResponse> query(QueryRequest query) {
+		return Mono.fromFuture(transport.performRequestAsync(query, QueryRequest._ENDPOINT, transportOptions));
+	}
+
+	/**
+	 * Executes a SQL request.
+	 */
+	public Mono<QueryResponse> query() {
+		return Mono.fromFuture(
+				transport.performRequestAsync(new QueryRequest.Builder().build(), QueryRequest._ENDPOINT, transportOptions));
+	}
+}

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

@@ -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.reactivestreams.Publisher;
 import org.springframework.data.domain.Sort;
 import org.springframework.data.elasticsearch.BulkFailureException;
@@ -57,19 +58,12 @@ import org.springframework.data.elasticsearch.core.document.Document;
 import org.springframework.data.elasticsearch.core.document.SearchDocument;
 import org.springframework.data.elasticsearch.core.document.SearchDocumentResponse;
 import org.springframework.data.elasticsearch.core.mapping.IndexCoordinates;
-import org.springframework.data.elasticsearch.core.query.BaseQuery;
-import org.springframework.data.elasticsearch.core.query.BaseQueryBuilder;
-import org.springframework.data.elasticsearch.core.query.BulkOptions;
-import org.springframework.data.elasticsearch.core.query.ByQueryResponse;
-import org.springframework.data.elasticsearch.core.query.DeleteQuery;
-import org.springframework.data.elasticsearch.core.query.Query;
-import org.springframework.data.elasticsearch.core.query.SearchTemplateQuery;
-import org.springframework.data.elasticsearch.core.query.UpdateQuery;
+import org.springframework.data.elasticsearch.core.query.*;
 import org.springframework.data.elasticsearch.core.query.UpdateResponse;
 import org.springframework.data.elasticsearch.core.reindex.ReindexRequest;
 import org.springframework.data.elasticsearch.core.reindex.ReindexResponse;
 import org.springframework.data.elasticsearch.core.script.Script;
-import org.springframework.lang.Nullable;
+import org.springframework.data.elasticsearch.core.sql.SqlResponse;
 import org.springframework.util.Assert;
 import org.springframework.util.CollectionUtils;
 import org.springframework.util.StringUtils;
@@ -88,6 +82,7 @@ public class ReactiveElasticsearchTemplate extends AbstractReactiveElasticsearch
 	private static final Log LOGGER = LogFactory.getLog(ReactiveElasticsearchTemplate.class);
 
 	private final ReactiveElasticsearchClient client;
+	private final ReactiveElasticsearchSqlClient sqlClient;
 	private final RequestConverter requestConverter;
 	private final ResponseConverter responseConverter;
 	private final JsonpMapper jsonpMapper;
@@ -99,6 +94,7 @@ public class ReactiveElasticsearchTemplate extends AbstractReactiveElasticsearch
 		Assert.notNull(client, "client must not be null");
 
 		this.client = client;
+		this.sqlClient = client.sql();
 		this.jsonpMapper = client._transport().jsonpMapper();
 		requestConverter = new RequestConverter(converter, jsonpMapper);
 		responseConverter = new ResponseConverter(jsonpMapper);
@@ -171,16 +167,6 @@ public class ReactiveElasticsearchTemplate extends AbstractReactiveElasticsearch
 				.onErrorReturn(NoSuchIndexException.class, false);
 	}
 
-	@Override
-	public Mono<ByQueryResponse> delete(Query query, Class<?> entityType, IndexCoordinates index) {
-
-		Assert.notNull(query, "query must not be null");
-
-		DeleteByQueryRequest request = requestConverter.documentDeleteByQueryRequest(query, routingResolver.getRouting(),
-				entityType, index, getRefreshPolicy());
-		return Mono.from(execute(client -> client.deleteByQuery(request))).map(responseConverter::byQueryResponse);
-	}
-
 	@Override
 	public Mono<ByQueryResponse> delete(DeleteQuery query, Class<?> entityType, IndexCoordinates index) {
 		Assert.notNull(query, "query must not be null");
@@ -646,6 +632,14 @@ public class ReactiveElasticsearchTemplate extends AbstractReactiveElasticsearch
 		return NativeQuery.builder().withIds(ids);
 	}
 
+	@Override
+	public Mono<SqlResponse> search(SqlQuery query) {
+		Assert.notNull(query, "Query must not be null.");
+
+		co.elastic.clients.elasticsearch.sql.QueryRequest request = requestConverter.sqlQueryRequest(query);
+		return sqlClient.query(request).onErrorMap(this::translateException).map(responseConverter::sqlResponse);
+	}
+
 	/**
 	 * Callback interface to be used with {@link #execute(ReactiveElasticsearchTemplate.ClientCallback<>)} for operating
 	 * directly on {@link ReactiveElasticsearchClient}.

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

@@ -15,7 +15,7 @@
  */
 package org.springframework.data.elasticsearch.client.elc;
 
-import static org.springframework.util.StringUtils.hasText;
+import static org.springframework.util.StringUtils.*;
 
 import co.elastic.clients.elasticsearch._types.AcknowledgedResponseBase;
 import co.elastic.clients.elasticsearch.indices.*;
@@ -24,10 +24,12 @@ import co.elastic.clients.transport.endpoints.BooleanResponse;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 
+import java.util.HashSet;
 import java.util.Map;
 import java.util.Objects;
 import java.util.Set;
 
+import org.jspecify.annotations.Nullable;
 import org.springframework.core.annotation.AnnotatedElementUtils;
 import org.springframework.dao.InvalidDataAccessApiUsageException;
 import org.springframework.data.elasticsearch.NoSuchIndexException;
@@ -46,9 +48,10 @@ import org.springframework.data.elasticsearch.core.index.GetIndexTemplateRequest
 import org.springframework.data.elasticsearch.core.index.GetTemplateRequest;
 import org.springframework.data.elasticsearch.core.index.PutIndexTemplateRequest;
 import org.springframework.data.elasticsearch.core.index.PutTemplateRequest;
+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;
 
 /**
@@ -130,8 +133,14 @@ public class ReactiveIndicesTemplate
 
 	private Mono<Boolean> doCreate(IndexCoordinates indexCoordinates, Map<String, Object> settings,
 			@Nullable Document mapping) {
+		Set<Alias> aliases = (boundClass != null) ? getAliasesFor(boundClass) : new HashSet<>();
+		CreateIndexSettings indexSettings = CreateIndexSettings.builder(indexCoordinates)
+				.withAliases(aliases)
+				.withSettings(settings)
+				.withMapping(mapping)
+				.build();
 
-		CreateIndexRequest createIndexRequest = requestConverter.indicesCreateRequest(indexCoordinates, settings, mapping);
+		CreateIndexRequest createIndexRequest = requestConverter.indicesCreateRequest(indexSettings);
 		Mono<CreateIndexResponse> createIndexResponse = Mono.from(execute(client -> client.create(createIndexRequest)));
 		return createIndexResponse.map(CreateIndexResponse::acknowledged);
 	}
@@ -435,6 +444,15 @@ public class ReactiveIndicesTemplate
 		return elasticsearchConverter.getMappingContext().getRequiredPersistentEntity(clazz).getIndexCoordinates();
 	}
 
+	/**
+	 * Get the {@link Alias} of the provided class.
+	 *
+	 * @param clazz provided class that can be used to extract aliases.
+	 */
+	private Set<Alias> getAliasesFor(Class<?> clazz) {
+		return elasticsearchConverter.getMappingContext().getRequiredPersistentEntity(clazz).getAliases();
+	}
+
 	private Class<?> checkForBoundClass() {
 		if (boundClass == null) {
 			throw new InvalidDataAccessApiUsageException("IndexOperations are not bound");

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

@@ -20,7 +20,6 @@ import static org.springframework.util.CollectionUtils.*;
 
 import co.elastic.clients.elasticsearch._types.Conflicts;
 import co.elastic.clients.elasticsearch._types.ExpandWildcard;
-import co.elastic.clients.elasticsearch._types.InlineScript;
 import co.elastic.clients.elasticsearch._types.NestedSortValue;
 import co.elastic.clients.elasticsearch._types.OpType;
 import co.elastic.clients.elasticsearch._types.SortOptions;
@@ -43,18 +42,20 @@ import co.elastic.clients.elasticsearch.core.bulk.CreateOperation;
 import co.elastic.clients.elasticsearch.core.bulk.IndexOperation;
 import co.elastic.clients.elasticsearch.core.bulk.UpdateOperation;
 import co.elastic.clients.elasticsearch.core.mget.MultiGetOperation;
-import co.elastic.clients.elasticsearch.core.msearch.MultisearchBody;
 import co.elastic.clients.elasticsearch.core.msearch.MultisearchHeader;
 import co.elastic.clients.elasticsearch.core.search.Highlight;
 import co.elastic.clients.elasticsearch.core.search.Rescore;
+import co.elastic.clients.elasticsearch.core.search.SearchRequestBody;
 import co.elastic.clients.elasticsearch.core.search.SourceConfig;
 import co.elastic.clients.elasticsearch.indices.*;
 import co.elastic.clients.elasticsearch.indices.ExistsIndexTemplateRequest;
 import co.elastic.clients.elasticsearch.indices.ExistsRequest;
 import co.elastic.clients.elasticsearch.indices.update_aliases.Action;
+import co.elastic.clients.elasticsearch.sql.query.SqlFormat;
 import co.elastic.clients.json.JsonData;
 import co.elastic.clients.json.JsonpDeserializer;
 import co.elastic.clients.json.JsonpMapper;
+import co.elastic.clients.util.NamedValue;
 import co.elastic.clients.util.ObjectBuilder;
 import jakarta.json.stream.JsonParser;
 
@@ -68,13 +69,16 @@ import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Set;
 import java.util.function.Function;
 import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.jetbrains.annotations.NotNull;
+import org.jspecify.annotations.Nullable;
 import org.springframework.dao.InvalidDataAccessApiUsageException;
 import org.springframework.data.domain.Sort;
 import org.springframework.data.elasticsearch.core.RefreshPolicy;
@@ -88,6 +92,8 @@ import org.springframework.data.elasticsearch.core.index.GetIndexTemplateRequest
 import org.springframework.data.elasticsearch.core.index.GetTemplateRequest;
 import org.springframework.data.elasticsearch.core.index.PutIndexTemplateRequest;
 import org.springframework.data.elasticsearch.core.index.PutTemplateRequest;
+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.ElasticsearchPersistentProperty;
 import org.springframework.data.elasticsearch.core.mapping.IndexCoordinates;
@@ -96,7 +102,6 @@ import org.springframework.data.elasticsearch.core.reindex.ReindexRequest;
 import org.springframework.data.elasticsearch.core.reindex.Remote;
 import org.springframework.data.elasticsearch.core.script.Script;
 import org.springframework.data.elasticsearch.support.DefaultStringObjectMap;
-import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.CollectionUtils;
 import org.springframework.util.StringUtils;
@@ -111,7 +116,6 @@ import org.springframework.util.StringUtils;
  * @author Haibo Liu
  * @since 4.4
  */
-@SuppressWarnings("ClassCanBeRecord")
 class RequestConverter extends AbstractQueryProcessor {
 
 	private static final Log LOGGER = LogFactory.getLog(RequestConverter.class);
@@ -170,7 +174,8 @@ class RequestConverter extends AbstractQueryProcessor {
 				}));
 	}
 
-	private Alias.Builder buildAlias(AliasActionParameters parameters, Alias.Builder aliasBuilder) {
+	private co.elastic.clients.elasticsearch.indices.Alias.Builder buildAlias(AliasActionParameters parameters,
+			co.elastic.clients.elasticsearch.indices.Alias.Builder aliasBuilder) {
 
 		if (parameters.getRouting() != null) {
 			aliasBuilder.routing(parameters.getRouting());
@@ -234,17 +239,25 @@ class RequestConverter extends AbstractQueryProcessor {
 		return new ExistsRequest.Builder().index(Arrays.asList(indexCoordinates.getIndexNames())).build();
 	}
 
-	public CreateIndexRequest indicesCreateRequest(IndexCoordinates indexCoordinates, Map<String, Object> settings,
-			@Nullable Document mapping) {
-
-		Assert.notNull(indexCoordinates, "indexCoordinates must not be null");
-		Assert.notNull(settings, "settings must not be null");
+	public CreateIndexRequest indicesCreateRequest(CreateIndexSettings indexSettings) {
+		Map<String, co.elastic.clients.elasticsearch.indices.Alias> aliases = new HashMap<>();
+		for (Alias alias : indexSettings.getAliases()) {
+			co.elastic.clients.elasticsearch.indices.Alias esAlias = co.elastic.clients.elasticsearch.indices.Alias
+					.of(ab -> ab.filter(getQuery(alias.getFilter(), null))
+							.routing(alias.getRouting())
+							.indexRouting(alias.getIndexRouting())
+							.searchRouting(alias.getSearchRouting())
+							.isHidden(alias.getHidden())
+							.isWriteIndex(alias.getWriteIndex()));
+			aliases.put(alias.getAlias(), esAlias);
+		}
 
 		// note: the new client does not support the index.storeType anymore
 		return new CreateIndexRequest.Builder() //
-				.index(indexCoordinates.getIndexName()) //
-				.settings(indexSettings(settings)) //
-				.mappings(typeMapping(mapping)) //
+				.index(indexSettings.getIndexCoordinates().getIndexName()) //
+				.aliases(aliases)
+				.settings(indexSettings(indexSettings.getSettings())) //
+				.mappings(typeMapping(indexSettings.getMapping())) //
 				.build();
 	}
 
@@ -399,7 +412,7 @@ class RequestConverter extends AbstractQueryProcessor {
 
 		if (putTemplateRequest.getSettings() != null) {
 			Map<String, JsonData> settings = getTemplateParams(putTemplateRequest.getSettings().entrySet());
-			builder.settings(settings);
+			builder.settings(sb -> sb.otherSettings(settings));
 		}
 
 		if (putTemplateRequest.getMappings() != null) {
@@ -520,6 +533,27 @@ class RequestConverter extends AbstractQueryProcessor {
 				.of(gtr -> gtr.name(getTemplateRequest.getTemplateName()).flatSettings(true));
 	}
 
+	public co.elastic.clients.elasticsearch.sql.QueryRequest sqlQueryRequest(SqlQuery query) {
+		Assert.notNull(query, "Query must not be null.");
+
+		return co.elastic.clients.elasticsearch.sql.QueryRequest.of(sqb -> sqb
+				.query(query.getQuery())
+				.catalog(query.getCatalog())
+				.columnar(query.getColumnar())
+				.cursor(query.getCursor())
+				.fetchSize(query.getFetchSize())
+				.fieldMultiValueLeniency(query.getFieldMultiValueLeniency())
+				.indexUsingFrozen(query.getIndexIncludeFrozen())
+				.keepAlive(time(query.getKeepAlive()))
+				.keepOnCompletion(query.getKeepOnCompletion())
+				.pageTimeout(time(query.getPageTimeout()))
+				.requestTimeout(time(query.getRequestTimeout()))
+				.waitForCompletionTimeout(time(query.getWaitForCompletionTimeout()))
+				.filter(getQuery(query.getFilter(), null))
+				.timeZone(Objects.toString(query.getTimeZone(), null))
+				.format(SqlFormat.Json));
+	}
+
 	// endregion
 
 	// region documents
@@ -704,8 +738,7 @@ class RequestConverter extends AbstractQueryProcessor {
 		return uob.build();
 	}
 
-	@Nullable
-	private co.elastic.clients.elasticsearch._types.Script getScript(@Nullable ScriptData scriptData) {
+	private co.elastic.clients.elasticsearch._types.@Nullable Script getScript(@Nullable ScriptData scriptData) {
 
 		if (scriptData == null) {
 			return null;
@@ -717,16 +750,11 @@ class RequestConverter extends AbstractQueryProcessor {
 			scriptData.params().forEach((key, value) -> params.put(key, JsonData.of(value, jsonpMapper)));
 		}
 		return co.elastic.clients.elasticsearch._types.Script.of(sb -> {
-			if (scriptData.type() == ScriptType.INLINE) {
-				sb.inline(is -> is //
-						.lang(scriptData.language()) //
-						.source(scriptData.script()) //
-						.params(params)); //
-			} else if (scriptData.type() == ScriptType.STORED) {
-				sb.stored(ss -> ss //
-						.id(scriptData.script()) //
-						.params(params) //
-				);
+			sb.lang(scriptData.language())
+			  	.params(params)
+				.id(scriptData.scriptName());
+			if (scriptData.script() != null){
+				sb.source(s -> s.scriptString(scriptData.script()));
 			}
 			return sb;
 		});
@@ -898,7 +926,13 @@ class RequestConverter extends AbstractQueryProcessor {
 
 		ReindexRequest.Script script = reindexRequest.getScript();
 		if (script != null) {
-			builder.script(s -> s.inline(InlineScript.of(i -> i.lang(script.getLang()).source(script.getSource()))));
+			builder.script(sb -> {
+				if (script.getSource() != null){
+					sb.source(s -> s.scriptString(script.getSource()));
+				}
+				sb.lang(script.getLang());
+				return sb;
+			});
 		}
 
 		builder.timeout(time(reindexRequest.getTimeout())) //
@@ -1016,7 +1050,7 @@ class RequestConverter extends AbstractQueryProcessor {
 											order = sortField.order().jsonValue();
 										}
 
-										return sortField.field() + ":" + order;
+										return sortField.field() + ':' + order;
 									})
 									.collect(Collectors.toList()));
 				}
@@ -1054,21 +1088,14 @@ class RequestConverter extends AbstractQueryProcessor {
 				}
 
 				uqb.script(sb -> {
-					if (query.getScriptType() == ScriptType.INLINE) {
-						sb.inline(is -> is //
-								.lang(query.getLang()) //
-								.source(query.getScript()) //
-								.params(params)); //
-					} else if (query.getScriptType() == ScriptType.STORED) {
-						sb.stored(ss -> ss //
-								.id(query.getScript()) //
-								.params(params) //
-						);
-					}
-					return sb;
+					sb.lang(query.getLang()).params(params);
+					if (query.getScript() != null){
+						sb.source(s -> s.scriptString(query.getScript()));
 					}
+					sb.id(query.getId());
 
-				);
+					return sb;
+				});
 			}
 
 			uqb //
@@ -1229,11 +1256,11 @@ class RequestConverter extends AbstractQueryProcessor {
 				mtrb.searchTemplates(stb -> stb
 						.header(msearchHeaderBuilder(query, param.index(), routing))
 						.body(bb -> {
-							bb //
-									.explain(query.getExplain()) //
-									.id(query.getId()) //
-									.source(query.getSource()) //
-							;
+							bb.explain(query.getExplain()) //
+								.id(query.getId()); //
+							if (query.getSource() != null){
+								bb.source(s -> s.scriptString(query.getSource()));
+							}
 
 							if (!CollectionUtils.isEmpty(query.getParams())) {
 								Map<String, JsonData> params = getTemplateParams(query.getParams().entrySet());
@@ -1269,11 +1296,15 @@ class RequestConverter extends AbstractQueryProcessor {
 									.timeout(timeStringMs(query.getTimeout())) //
 							;
 
-							if (query.getPageable().isPaged()) {
-								bb //
-										.from((int) query.getPageable().getOffset()) //
-										.size(query.getPageable().getPageSize());
-							}
+							var offset = query.getPageable().isPaged() ? query.getPageable().getOffset() : 0;
+							var pageSize = query.getPageable().isPaged() ? query.getPageable().getPageSize()
+									: INDEX_MAX_RESULT_WINDOW;
+							// if we have both a page size and a max results, we take the min, this is necessary for
+							// searchForStream to work correctly (#3098) as there the page size defines what is
+							// returned in a single request, and the max result determines the total number of
+							// documents returned
+							var size = query.isLimiting() ? Math.min(pageSize, query.getMaxResults()) : pageSize;
+							bb.from((int) offset).size(size);
 
 							if (!isEmpty(query.getFields())) {
 								bb.fields(fb -> {
@@ -1286,10 +1317,6 @@ class RequestConverter extends AbstractQueryProcessor {
 								bb.storedFields(query.getStoredFields());
 							}
 
-							if (query.isLimiting()) {
-								bb.size(query.getMaxResults());
-							}
-
 							if (query.getMinScore() > 0) {
 								bb.minScore((double) query.getMinScore());
 							}
@@ -1323,17 +1350,18 @@ class RequestConverter extends AbstractQueryProcessor {
 										String script = runtimeField.getScript();
 
 										if (script != null) {
-											rfb
-													.script(s -> s
-															.inline(is -> {
-																is.source(script);
+											rfb.script(s -> {
+												if (script != null) {
+													s.source(so -> so.scriptString(script));
+												}
 
 												if (runtimeField.getParams() != null) {
-																	is.params(TypeUtils.paramsMap(runtimeField.getParams()));
+													s.params(TypeUtils.paramsMap(runtimeField.getParams()));
 												}
-																return is;
-															}));
+												return s;
+											});
 										}
+
 										return rfb;
 									});
 									runtimeMappings.put(runtimeField.getName(), esRuntimeField);
@@ -1342,9 +1370,14 @@ class RequestConverter extends AbstractQueryProcessor {
 							}
 
 							if (!isEmpty(query.getIndicesBoost())) {
-								bb.indicesBoost(query.getIndicesBoost().stream()
-										.map(indexBoost -> Map.of(indexBoost.getIndexName(), (double) indexBoost.getBoost()))
-										.collect(Collectors.toList()));
+								Stream<NamedValue<Double>> namedValueStream = query.getIndicesBoost().stream()
+										.map(indexBoost -> {
+											var namedValue = new NamedValue(indexBoost.getIndexName(),
+													Float.valueOf(indexBoost.getBoost()).doubleValue());
+											return namedValue;
+										});
+								List<NamedValue<Double>> namedValueList = namedValueStream.collect(Collectors.toList());
+								bb.indicesBoost(namedValueList);
 							}
 
 							query.getScriptedFields().forEach(scriptedField -> bb.scriptFields(scriptedField.getFieldName(),
@@ -1370,7 +1403,7 @@ class RequestConverter extends AbstractQueryProcessor {
 	private Function<MultisearchHeader.Builder, ObjectBuilder<MultisearchHeader>> msearchHeaderBuilder(Query query,
 			IndexCoordinates index, @Nullable String routing) {
 		return h -> {
-			var searchType = (query instanceof NativeQuery nativeQuery && nativeQuery.getKnnQuery() != null) ? null
+			var searchType = (query instanceof NativeQuery nativeQuery && !isEmpty(nativeQuery.getKnnSearches())) ? null
 					: searchType(query.getSearchType());
 
 			h //
@@ -1402,7 +1435,7 @@ class RequestConverter extends AbstractQueryProcessor {
 
 		ElasticsearchPersistentEntity<?> persistentEntity = getPersistentEntity(clazz);
 
-		var searchType = (query instanceof NativeQuery nativeQuery && nativeQuery.getKnnQuery() != null) ? null
+		var searchType = (query instanceof NativeQuery nativeQuery && !isEmpty(nativeQuery.getKnnSearches())) ? null
 				: searchType(query.getSearchType());
 
 		builder //
@@ -1443,13 +1476,14 @@ class RequestConverter extends AbstractQueryProcessor {
 			builder.seqNoPrimaryTerm(true);
 		}
 
-		if (query.getPageable().isPaged()) {
-			builder //
-					.from((int) query.getPageable().getOffset()) //
-					.size(query.getPageable().getPageSize());
-		} else {
-			builder.from(0).size(INDEX_MAX_RESULT_WINDOW);
-		}
+		var offset = query.getPageable().isPaged() ? query.getPageable().getOffset() : 0;
+		var pageSize = query.getPageable().isPaged() ? query.getPageable().getPageSize() : INDEX_MAX_RESULT_WINDOW;
+		// if we have both a page size and a max results, we take the min, this is necessary for
+		// searchForStream to work correctly (#3098) as there the page size defines what is
+		// returned in a single request, and the max result determines the total number of
+		// documents returned
+		var size = query.isLimiting() ? Math.min(pageSize, query.getMaxResults()) : pageSize;
+		builder.from((int) offset).size(size);
 
 		if (!isEmpty(query.getFields())) {
 			var fieldAndFormats = query.getFields().stream().map(field -> FieldAndFormat.of(b -> b.field(field))).toList();
@@ -1464,10 +1498,6 @@ class RequestConverter extends AbstractQueryProcessor {
 			addIndicesOptions(builder, query.getIndicesOptions());
 		}
 
-		if (query.isLimiting()) {
-			builder.size(query.getMaxResults());
-		}
-
 		if (query.getMinScore() > 0) {
 			builder.minScore((double) query.getMinScore());
 		}
@@ -1524,16 +1554,16 @@ class RequestConverter extends AbstractQueryProcessor {
 						rfb.type(RuntimeFieldType._DESERIALIZER.parse(runtimeField.getType()));
 						String script = runtimeField.getScript();
 						if (script != null) {
-							rfb
-									.script(s -> s
-											.inline(is -> {
-												is.source(script);
+							rfb.script(s -> {
+								if (script != null) {
+									s.source(so -> so.scriptString(script));
+								}
 
 								if (runtimeField.getParams() != null) {
-													is.params(TypeUtils.paramsMap(runtimeField.getParams()));
+									s.params(TypeUtils.paramsMap(runtimeField.getParams()));
 								}
-												return is;
-											}));
+								return s;
+							});
 						}
 
 						return rfb;
@@ -1555,9 +1585,14 @@ class RequestConverter extends AbstractQueryProcessor {
 		}
 
 		if (!isEmpty(query.getIndicesBoost())) {
-			builder.indicesBoost(query.getIndicesBoost().stream()
-					.map(indexBoost -> Map.of(indexBoost.getIndexName(), (double) indexBoost.getBoost()))
-					.collect(Collectors.toList()));
+			Stream<NamedValue<Double>> namedValueStream = query.getIndicesBoost().stream()
+					.map(indexBoost -> {
+						var namedValue = new NamedValue(indexBoost.getIndexName(),
+								Float.valueOf(indexBoost.getBoost()).doubleValue());
+						return namedValue;
+					});
+			List<NamedValue<Double>> namedValueList = namedValueStream.collect(Collectors.toList());
+			builder.indicesBoost(namedValueList);
 		}
 
 		if (!isEmpty(query.getDocValueFields())) {
@@ -1619,7 +1654,7 @@ class RequestConverter extends AbstractQueryProcessor {
 		builder.highlight(highlight);
 	}
 
-	private void addHighlight(Query query, MultisearchBody.Builder builder) {
+	private void addHighlight(Query query, SearchRequestBody.Builder builder) {
 
 		Highlight highlight = query.getHighlightQuery()
 				.map(highlightQuery -> new HighlightQueryBuilder(elasticsearchConverter.getMappingContext(), this)
@@ -1699,7 +1734,7 @@ class RequestConverter extends AbstractQueryProcessor {
 	}
 
 	@Nullable
-	private NestedSortValue getNestedSort(@Nullable Order.Nested nested,
+	private NestedSortValue getNestedSort(Order.@Nullable Nested nested,
 			@Nullable ElasticsearchPersistentEntity<?> persistentEntity) {
 		return (nested == null || persistentEntity == null) ? null
 				: NestedSortValue.of(b -> b //
@@ -1729,17 +1764,6 @@ class RequestConverter extends AbstractQueryProcessor {
 				.sort(query.getSortOptions()) //
 		;
 
-		if (query.getKnnQuery() != null) {
-			var kq = query.getKnnQuery();
-			builder.knn(ksb -> ksb
-					.field(kq.field())
-					.queryVector(kq.queryVector())
-					.numCandidates(kq.numCandidates())
-					.filter(kq.filter())
-					.similarity(kq.similarity()));
-
-		}
-
 		if (!isEmpty(query.getKnnSearches())) {
 			builder.knn(query.getKnnSearches());
 		}
@@ -1754,24 +1778,13 @@ class RequestConverter extends AbstractQueryProcessor {
 	}
 
 	@SuppressWarnings("DuplicatedCode")
-	private void prepareNativeSearch(NativeQuery query, MultisearchBody.Builder builder) {
+	private void prepareNativeSearch(NativeQuery query, SearchRequestBody.Builder builder) {
 
 		builder //
 				.suggest(query.getSuggester()) //
 				.collapse(query.getFieldCollapse()) //
 				.sort(query.getSortOptions());
 
-		if (query.getKnnQuery() != null) {
-			var kq = query.getKnnQuery();
-			builder.knn(ksb -> ksb
-					.field(kq.field())
-					.queryVector(kq.queryVector())
-					.numCandidates(kq.numCandidates())
-					.filter(kq.filter())
-					.similarity(kq.similarity()));
-
-		}
-
 		if (!isEmpty(query.getKnnSearches())) {
 			builder.knn(query.getKnnSearches());
 		}
@@ -1785,13 +1798,11 @@ class RequestConverter extends AbstractQueryProcessor {
 		}
 	}
 
-	@Nullable
-	co.elastic.clients.elasticsearch._types.query_dsl.Query getQuery(@Nullable Query query,
+	co.elastic.clients.elasticsearch._types.query_dsl.@Nullable Query getQuery(@Nullable Query query,
 			@Nullable Class<?> clazz) {
 		return getEsQuery(query, (q) -> elasticsearchConverter.updateQuery(q, clazz));
 	}
 
-	@SuppressWarnings("StatementWithEmptyBody")
 	private void addPostFilter(Query query, SearchRequest.Builder builder) {
 
 		// we only need to handle NativeQuery here. filter from a CriteriaQuery are added into the query and not as post
@@ -1886,10 +1897,11 @@ class RequestConverter extends AbstractQueryProcessor {
 					.id(query.getId()) //
 					.index(Arrays.asList(index.getIndexNames())) //
 					.preference(query.getPreference()) //
-					.searchType(searchType(query.getSearchType())) //
-					.source(query.getSource()) //
-			;
+					.searchType(searchType(query.getSearchType())); //
 
+			if (query.getSource() != null) {
+				builder.source(so -> so.scriptString(query.getSource()));
+			}
 			if (query.getRoute() != null) {
 				builder.routing(query.getRoute());
 			} else if (StringUtils.hasText(routing)) {
@@ -1932,7 +1944,7 @@ class RequestConverter extends AbstractQueryProcessor {
 				.id(script.id()) //
 				.script(sb -> sb //
 					.lang(script.language()) //
-						.source(script.source())));
+					.source(s -> s.scriptString(script.source()))));
 	}
 
 	public GetScriptRequest scriptGet(String name) {
@@ -2022,9 +2034,12 @@ class RequestConverter extends AbstractQueryProcessor {
 	private SourceConfig getSourceConfig(Query query) {
 
 		if (query.getSourceFilter() != null) {
-			return SourceConfig.of(s -> s //
-					.filter(sfb -> {
+			return SourceConfig.of(s -> {
 				SourceFilter sourceFilter = query.getSourceFilter();
+				if (sourceFilter.fetchSource() != null) {
+					s.fetch(sourceFilter.fetchSource());
+				} else {
+					s.filter(sfb -> {
 						String[] includes = sourceFilter.getIncludes();
 						String[] excludes = sourceFilter.getExcludes();
 
@@ -2037,7 +2052,10 @@ class RequestConverter extends AbstractQueryProcessor {
 						}
 
 						return sfb;
-					}));
+					});
+				}
+				return s;
+			});
 		} else {
 			return null;
 		}

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

@@ -33,6 +33,8 @@ import co.elastic.clients.elasticsearch.core.mget.MultiGetResponseItem;
 import co.elastic.clients.elasticsearch.indices.*;
 import co.elastic.clients.elasticsearch.indices.get_index_template.IndexTemplateItem;
 import co.elastic.clients.elasticsearch.indices.get_mapping.IndexMappingRecord;
+import co.elastic.clients.elasticsearch.sql.QueryResponse;
+import co.elastic.clients.json.JsonData;
 import co.elastic.clients.json.JsonpMapper;
 
 import java.util.ArrayList;
@@ -46,6 +48,7 @@ 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.ElasticsearchErrorCause;
 import org.springframework.data.elasticsearch.core.IndexInformation;
 import org.springframework.data.elasticsearch.core.MultiGetItem;
@@ -61,8 +64,8 @@ import org.springframework.data.elasticsearch.core.query.ByQueryResponse;
 import org.springframework.data.elasticsearch.core.query.StringQuery;
 import org.springframework.data.elasticsearch.core.reindex.ReindexResponse;
 import org.springframework.data.elasticsearch.core.script.Script;
+import org.springframework.data.elasticsearch.core.sql.SqlResponse;
 import org.springframework.data.elasticsearch.support.DefaultStringObjectMap;
-import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**
@@ -89,7 +92,7 @@ class ResponseConverter {
 		return ClusterHealth.builder() //
 				.withActivePrimaryShards(healthResponse.activePrimaryShards()) //
 				.withActiveShards(healthResponse.activeShards()) //
-				.withActiveShardsPercent(Double.parseDouble(healthResponse.activeShardsPercentAsNumber()))//
+				.withActiveShardsPercent(healthResponse.activeShardsPercentAsNumber())//
 				.withClusterName(healthResponse.clusterName()) //
 				.withDelayedUnassignedShards(healthResponse.delayedUnassignedShards()) //
 				.withInitializingShards(healthResponse.initializingShards()) //
@@ -188,7 +191,7 @@ class ResponseConverter {
 		Assert.notNull(getMappingResponse, "getMappingResponse must not be null");
 		Assert.notNull(indexCoordinates, "indexCoordinates must not be null");
 
-		Map<String, IndexMappingRecord> mappings = getMappingResponse.result();
+		Map<String, IndexMappingRecord> mappings = getMappingResponse.mappings();
 
 		if (mappings == null || mappings.isEmpty()) {
 			return Document.create();
@@ -216,7 +219,7 @@ class ResponseConverter {
 
 		List<IndexInformation> indexInformationList = new ArrayList<>();
 
-		getIndexResponse.result().forEach((indexName, indexState) -> {
+		getIndexResponse.indices().forEach((indexName, indexState) -> {
 			Settings settings = indexState.settings() != null ? Settings.parse(toJson(indexState.settings(), jsonpMapper))
 					: new Settings();
 			Document mappings = indexState.mappings() != null ? Document.parse(toJson(indexState.mappings(), jsonpMapper))
@@ -236,7 +239,7 @@ class ResponseConverter {
 		Assert.notNull(getAliasResponse, "getAliasResponse must not be null");
 
 		Map<String, Set<AliasData>> aliasDataMap = new HashMap<>();
-		getAliasResponse.result().forEach((indexName, alias) -> {
+		getAliasResponse.aliases().forEach((indexName, alias) -> {
 			Set<AliasData> aliasDataSet = new HashSet<>();
 			alias.aliases()
 					.forEach((aliasName, aliasDefinition) -> aliasDataSet.add(indicesGetAliasData(aliasName, aliasDefinition)));
@@ -397,7 +400,6 @@ class ResponseConverter {
 	private ReindexResponse.Failure reindexResponseFailureOf(BulkIndexByScrollFailure failure) {
 		return ReindexResponse.Failure.builder() //
 				.withIndex(failure.index()) //
-				.withType(failure.type()) //
 				.withId(failure.id()) //
 				.withStatus(failure.status())//
 				.withErrorCause(toErrorCause(failure.cause())) //
@@ -408,14 +410,12 @@ class ResponseConverter {
 	private ByQueryResponse.Failure byQueryResponseFailureOf(BulkIndexByScrollFailure failure) {
 		return ByQueryResponse.Failure.builder() //
 				.withIndex(failure.index()) //
-				.withType(failure.type()) //
 				.withId(failure.id()) //
 				.withStatus(failure.status())//
 				.withErrorCause(toErrorCause(failure.cause())).build();
 	}
 
-	@Nullable
-	public static MultiGetItem.Failure getFailure(MultiGetResponseItem<EntityAsMap> itemResponse) {
+	public static MultiGetItem.@Nullable Failure getFailure(MultiGetResponseItem<EntityAsMap> itemResponse) {
 
 		MultiGetError responseFailure = itemResponse.isFailure() ? itemResponse.failure() : null;
 
@@ -497,6 +497,10 @@ class ResponseConverter {
 			builder.withDeleted(response.deleted());
 		}
 
+		if(response.updated() != null) {
+			builder.withUpdated(response.updated());
+		}
+
 		if (response.batches() != null) {
 			builder.withBatches(Math.toIntExact(response.batches()));
 		}
@@ -531,11 +535,34 @@ class ResponseConverter {
 				? Script.builder() //
 						.withId(response.id()) //
 						.withLanguage(response.script().lang()) //
-						.withSource(response.script().source()).build() //
+						.withSource(response.script().source().scriptString()).build() //
 				: null;
 	}
 	// endregion
 
+	// region sql
+	public SqlResponse sqlResponse(QueryResponse response) {
+		SqlResponse.Builder builder = SqlResponse.builder();
+		builder.withRunning(Boolean.TRUE.equals(response.isRunning()))
+				.withPartial(Boolean.TRUE.equals(response.isPartial())).withCursor(response.cursor());
+
+		final List<SqlResponse.Column> columns = response.columns().stream()
+				.map(column -> new SqlResponse.Column(column.name(), column.type())).toList();
+		builder.withColumns(columns);
+
+		for (List<JsonData> rowValues : response.rows()) {
+			SqlResponse.Row.Builder rowBuilder = SqlResponse.Row.builder();
+			for (int idx = 0; idx < rowValues.size(); idx++) {
+				rowBuilder.withValue(columns.get(idx), rowValues.get(idx).toJson());
+			}
+
+			builder.withRow(rowBuilder.build());
+		}
+
+		return builder.build();
+	}
+	// end region
+
 	// region helper functions
 
 	private long timeToLong(Time time) {

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

@@ -29,6 +29,7 @@ import co.elastic.clients.elasticsearch.core.search.Suggestion;
 import co.elastic.clients.elasticsearch.core.search.TotalHits;
 import co.elastic.clients.json.JsonpMapper;
 
+import java.time.Duration;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -38,6 +39,7 @@ 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.core.SearchShardStatistics;
 import org.springframework.data.elasticsearch.core.TotalHitsRelation;
 import org.springframework.data.elasticsearch.core.document.SearchDocument;
@@ -47,7 +49,6 @@ import org.springframework.data.elasticsearch.core.suggest.response.PhraseSugges
 import org.springframework.data.elasticsearch.core.suggest.response.Suggest;
 import org.springframework.data.elasticsearch.core.suggest.response.TermSuggestion;
 import org.springframework.data.elasticsearch.support.ScoreDoc;
-import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.CollectionUtils;
 
@@ -56,6 +57,7 @@ import org.springframework.util.CollectionUtils;
  *
  * @author Peter-Josef Meisch
  * @author Haibo Liu
+ * @author Mohamed El Harrougui
  * @since 4.4
  */
 class SearchDocumentResponseBuilder {
@@ -83,8 +85,10 @@ class SearchDocumentResponseBuilder {
 		Map<String, List<Suggestion<EntityAsMap>>> suggest = responseBody.suggest();
 		var pointInTimeId = responseBody.pitId();
 		var shards = responseBody.shards();
+		var executionDurationInMillis = responseBody.took();
 
-		return from(hitsMetadata, shards, scrollId, pointInTimeId, aggregations, suggest, entityCreator, jsonpMapper);
+		return from(hitsMetadata, shards, scrollId, pointInTimeId, executionDurationInMillis, aggregations, suggest,
+				entityCreator, jsonpMapper);
 	}
 
 	/**
@@ -109,8 +113,10 @@ class SearchDocumentResponseBuilder {
 		var aggregations = response.aggregations();
 		var suggest = response.suggest();
 		var pointInTimeId = response.pitId();
+		var executionDurationInMillis = response.took();
 
-		return from(hitsMetadata, shards, scrollId, pointInTimeId, aggregations, suggest, entityCreator, jsonpMapper);
+		return from(hitsMetadata, shards, scrollId, pointInTimeId, executionDurationInMillis, aggregations, suggest,
+				entityCreator, jsonpMapper);
 	}
 
 	/**
@@ -127,7 +133,8 @@ class SearchDocumentResponseBuilder {
 	 * @return the {@link SearchDocumentResponse}
 	 */
 	public static <T> SearchDocumentResponse from(HitsMetadata<?> hitsMetadata, @Nullable ShardStatistics shards,
-			@Nullable String scrollId, @Nullable String pointInTimeId, @Nullable Map<String, Aggregate> aggregations,
+			@Nullable String scrollId, @Nullable String pointInTimeId, long executionDurationInMillis,
+			@Nullable Map<String, Aggregate> aggregations,
 			Map<String, List<Suggestion<EntityAsMap>>> suggestES, SearchDocumentResponse.EntityCreator<T> entityCreator,
 			JsonpMapper jsonpMapper) {
 
@@ -151,6 +158,8 @@ class SearchDocumentResponseBuilder {
 
 		float maxScore = hitsMetadata.maxScore() != null ? hitsMetadata.maxScore().floatValue() : Float.NaN;
 
+		Duration executionDuration = Duration.ofMillis(executionDurationInMillis);
+
 		List<SearchDocument> searchDocuments = new ArrayList<>();
 		for (Hit<?> hit : hitsMetadata.hits()) {
 			searchDocuments.add(DocumentAdapters.from(hit, jsonpMapper));
@@ -163,7 +172,8 @@ class SearchDocumentResponseBuilder {
 
 		SearchShardStatistics shardStatistics = shards != null ? shardsFrom(shards) : null;
 
-		return new SearchDocumentResponse(totalHits, totalHitsRelation, maxScore, scrollId, pointInTimeId, searchDocuments,
+		return new SearchDocumentResponse(totalHits, totalHitsRelation, maxScore, executionDuration, scrollId,
+				pointInTimeId, searchDocuments,
 				aggregationsContainer, suggest, shardStatistics);
 	}
 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

@@ -15,12 +15,13 @@
  */
 package org.springframework.data.elasticsearch.core;
 
+import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.cluster.ClusterOperations;
 import org.springframework.data.elasticsearch.core.convert.ElasticsearchConverter;
 import org.springframework.data.elasticsearch.core.mapping.IndexCoordinates;
 import org.springframework.data.elasticsearch.core.routing.RoutingResolver;
 import org.springframework.data.elasticsearch.core.script.ScriptOperations;
-import org.springframework.lang.Nullable;
+import org.springframework.data.elasticsearch.core.sql.SqlOperations;
 
 /**
  * ElasticsearchOperations. Since 4.0 this interface only contains common helper functions, the other methods have been
@@ -35,7 +36,7 @@ import org.springframework.lang.Nullable;
  * @author Dmitriy Yakovlev
  * @author Peter-Josef Meisch
  */
-public interface ElasticsearchOperations extends DocumentOperations, SearchOperations, ScriptOperations {
+public interface ElasticsearchOperations extends DocumentOperations, SearchOperations, ScriptOperations, SqlOperations {
 
 	/**
 	 * get an {@link IndexOperations} that is bound to the given class

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

@@ -15,13 +15,14 @@
  */
 package org.springframework.data.elasticsearch.core;
 
+import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.cluster.ReactiveClusterOperations;
 import org.springframework.data.elasticsearch.core.convert.ElasticsearchConverter;
 import org.springframework.data.elasticsearch.core.mapping.ElasticsearchPersistentEntity;
 import org.springframework.data.elasticsearch.core.mapping.IndexCoordinates;
 import org.springframework.data.elasticsearch.core.routing.RoutingResolver;
 import org.springframework.data.elasticsearch.core.script.ReactiveScriptOperations;
-import org.springframework.lang.Nullable;
+import org.springframework.data.elasticsearch.core.sql.ReactiveSqlOperations;
 
 /**
  * Interface that specifies a basic set of Elasticsearch operations executed in a reactive way.
@@ -31,7 +32,7 @@ import org.springframework.lang.Nullable;
  * @since 3.2
  */
 public interface ReactiveElasticsearchOperations
-		extends ReactiveDocumentOperations, ReactiveSearchOperations, ReactiveScriptOperations {
+		extends ReactiveDocumentOperations, ReactiveSearchOperations, ReactiveScriptOperations, ReactiveSqlOperations {
 
 	/**
 	 * Get the {@link ElasticsearchConverter} used.

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

@@ -17,14 +17,17 @@ package org.springframework.data.elasticsearch.core;
 
 import reactor.core.publisher.Flux;
 
+import java.time.Duration;
+
+import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.suggest.response.Suggest;
-import org.springframework.lang.Nullable;
 
 /**
  * Encapsulates a Flux of {@link SearchHit}s with additional information from the search.
  *
  * @param <T> the result data class.
  * @author Peter-Josef Meisch
+ * @author Mohamed El Harrougui
  * @since 4.4
  */
 public interface ReactiveSearchHits<T> {
@@ -37,6 +40,11 @@ public interface ReactiveSearchHits<T> {
 
 	float getMaxScore();
 
+	/**
+	 * @return the execution duration it took to complete the request
+	 */
+	Duration getExecutionDuration();
+
 	/**
 	 * @return the {@link SearchHit}s from the search result.
 	 */

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

@@ -17,11 +17,14 @@ package org.springframework.data.elasticsearch.core;
 
 import reactor.core.publisher.Flux;
 
+import java.time.Duration;
+
+import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.suggest.response.Suggest;
-import org.springframework.lang.Nullable;
 
 /**
  * @author Peter-Josef Meisch
+ * @author Mohamed El Harrougui
  * @since 4.4
  */
 public class ReactiveSearchHitsImpl<T> implements ReactiveSearchHits<T> {
@@ -58,6 +61,11 @@ public class ReactiveSearchHitsImpl<T> implements ReactiveSearchHits<T> {
 		return delegate.getMaxScore();
 	}
 
+	@Override
+	public Duration getExecutionDuration() {
+		return delegate.getExecutionDuration();
+	}
+
 	@Override
 	public boolean hasSearchHits() {
 		return delegate.hasSearchHits();

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

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

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

@@ -15,6 +15,7 @@
  */
 package org.springframework.data.elasticsearch.core;
 
+import java.time.Duration;
 import java.util.ArrayList;
 import java.util.LinkedHashMap;
 import java.util.LinkedList;
@@ -22,6 +23,7 @@ import java.util.List;
 import java.util.Map;
 import java.util.stream.Collectors;
 
+import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.UncategorizedElasticsearchException;
 import org.springframework.data.elasticsearch.core.convert.ElasticsearchConverter;
 import org.springframework.data.elasticsearch.core.document.Document;
@@ -33,7 +35,6 @@ import org.springframework.data.elasticsearch.core.mapping.ElasticsearchPersiste
 import org.springframework.data.elasticsearch.core.suggest.response.CompletionSuggestion;
 import org.springframework.data.elasticsearch.core.suggest.response.Suggest;
 import org.springframework.data.mapping.context.MappingContext;
-import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**
@@ -47,6 +48,7 @@ import org.springframework.util.Assert;
  * @author Sascha Woo
  * @author Jakob Hoeper
  * @author Haibo Liu
+ * @author Mohamed El Harrougui
  * @since 4.0
  */
 public class SearchHitMapping<T> {
@@ -87,6 +89,7 @@ public class SearchHitMapping<T> {
 		long totalHits = searchDocumentResponse.getTotalHits();
 		SearchShardStatistics shardStatistics = searchDocumentResponse.getSearchShardStatistics();
 		float maxScore = searchDocumentResponse.getMaxScore();
+		Duration executionDuration = searchDocumentResponse.getExecutionDuration();
 		String scrollId = searchDocumentResponse.getScrollId();
 		String pointInTimeId = searchDocumentResponse.getPointInTimeId();
 
@@ -104,8 +107,8 @@ public class SearchHitMapping<T> {
 		Suggest suggest = searchDocumentResponse.getSuggest();
 		mapHitsInCompletionSuggestion(suggest);
 
-		return new SearchHitsImpl<>(totalHits, totalHitsRelation, maxScore, scrollId, pointInTimeId, searchHits,
-				aggregations, suggest, shardStatistics);
+		return new SearchHitsImpl<>(totalHits, totalHitsRelation, maxScore, executionDuration, scrollId, pointInTimeId,
+				searchHits, aggregations, suggest, shardStatistics);
 	}
 
 	@SuppressWarnings("unchecked")
@@ -238,6 +241,7 @@ public class SearchHitMapping<T> {
 				return new SearchHitsImpl<>(searchHits.getTotalHits(),
 						searchHits.getTotalHitsRelation(),
 						searchHits.getMaxScore(),
+						searchHits.getExecutionDuration(),
 						scrollId,
 						searchHits.getPointInTimeId(),
 						convertedSearchHits,

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

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

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

@@ -15,12 +15,13 @@
  */
 package org.springframework.data.elasticsearch.core;
 
+import java.time.Duration;
 import java.util.Iterator;
 import java.util.List;
 
+import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.suggest.response.Suggest;
 import org.springframework.data.util.Streamable;
-import org.springframework.lang.Nullable;
 
 /**
  * Encapsulates a list of {@link SearchHit}s with additional information from the search.
@@ -28,6 +29,7 @@ import org.springframework.lang.Nullable;
  * @param <T> the result data class.
  * @author Sascha Woo
  * @author Haibo Liu
+ * @author Mohamed El Harrougui
  * @since 4.0
  */
 public interface SearchHits<T> extends Streamable<SearchHit<T>> {
@@ -43,6 +45,11 @@ public interface SearchHits<T> extends Streamable<SearchHit<T>> {
 	 */
 	float getMaxScore();
 
+	/**
+	 * @return the execution duration it took to complete the request
+	 */
+	Duration getExecutionDuration();
+
 	/**
 	 * @param index position in List.
 	 * @return the {@link SearchHit} at position {index}

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

@@ -15,12 +15,13 @@
  */
 package org.springframework.data.elasticsearch.core;
 
+import java.time.Duration;
 import java.util.Collections;
 import java.util.List;
 
+import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.core.suggest.response.Suggest;
 import org.springframework.data.util.Lazy;
-import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**
@@ -30,6 +31,7 @@ import org.springframework.util.Assert;
  * @author Peter-Josef Meisch
  * @author Sascha Woo
  * @author Haibo Liu
+ * @author Mohamed El Harrougui
  * @since 4.0
  */
 public class SearchHitsImpl<T> implements SearchScrollHits<T> {
@@ -37,6 +39,7 @@ public class SearchHitsImpl<T> implements SearchScrollHits<T> {
 	private final long totalHits;
 	private final TotalHitsRelation totalHitsRelation;
 	private final float maxScore;
+	private final Duration executionDuration;
 	@Nullable private final String scrollId;
 	private final List<? extends SearchHit<T>> searchHits;
 	private final Lazy<List<SearchHit<T>>> unmodifiableSearchHits;
@@ -49,12 +52,13 @@ public class SearchHitsImpl<T> implements SearchScrollHits<T> {
 	 * @param totalHits the number of total hits for the search
 	 * @param totalHitsRelation the relation {@see TotalHitsRelation}, must not be {@literal null}
 	 * @param maxScore the maximum score
+	 * @param executionDuration the execution duration it took to complete the request
 	 * @param scrollId the scroll id if available
 	 * @param searchHits must not be {@literal null}
 	 * @param aggregations the aggregations if available
 	 */
-	public SearchHitsImpl(long totalHits, TotalHitsRelation totalHitsRelation, float maxScore, @Nullable String scrollId,
-			@Nullable String pointInTimeId, List<? extends SearchHit<T>> searchHits,
+	public SearchHitsImpl(long totalHits, TotalHitsRelation totalHitsRelation, float maxScore, Duration executionDuration,
+			@Nullable String scrollId, @Nullable String pointInTimeId, List<? extends SearchHit<T>> searchHits,
 			@Nullable AggregationsContainer<?> aggregations, @Nullable Suggest suggest,
 			@Nullable SearchShardStatistics searchShardStatistics) {
 
@@ -63,6 +67,7 @@ public class SearchHitsImpl<T> implements SearchScrollHits<T> {
 		this.totalHits = totalHits;
 		this.totalHitsRelation = totalHitsRelation;
 		this.maxScore = maxScore;
+		this.executionDuration = executionDuration;
 		this.scrollId = scrollId;
 		this.pointInTimeId = pointInTimeId;
 		this.searchHits = searchHits;
@@ -88,6 +93,11 @@ public class SearchHitsImpl<T> implements SearchScrollHits<T> {
 		return maxScore;
 	}
 
+	@Override
+	public Duration getExecutionDuration() {
+		return executionDuration;
+	}
+
 	@Override
 	@Nullable
 	public String getScrollId() {
@@ -133,6 +143,7 @@ public class SearchHitsImpl<T> implements SearchScrollHits<T> {
 				"totalHits=" + totalHits + //
 				", totalHitsRelation=" + totalHitsRelation + //
 				", maxScore=" + maxScore + //
+				", executionDuration=" + executionDuration + //
 				", scrollId='" + scrollId + '\'' + //
 				", pointInTimeId='" + pointInTimeId + '\'' + //
 				", searchHits={" + searchHits.size() + " elements}" + //

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

@@ -15,14 +15,17 @@
  */
 package org.springframework.data.elasticsearch.core;
 
+import java.time.Duration;
+
+import org.jspecify.annotations.Nullable;
 import org.springframework.data.util.CloseableIterator;
-import org.springframework.lang.Nullable;
 
 /**
  * A {@link SearchHitsIterator} encapsulates {@link SearchHit} results that can be wrapped in a Java 8
  * {@link java.util.stream.Stream}.
  *
  * @author Sascha Woo
+ * @author Mohamed El Harrougui
  * @param <T>
  * @since 4.0
  */
@@ -39,6 +42,11 @@ public interface SearchHitsIterator<T> extends CloseableIterator<SearchHit<T>> {
 	 */
 	float getMaxScore();
 
+	/**
+	 * @return the execution duration it took to complete the request
+	 */
+	Duration getExecutionDuration();
+
 	/**
 	 * @return the number of total hits.
 	 */

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

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

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

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

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

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

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

@@ -15,6 +15,7 @@
  */
 package org.springframework.data.elasticsearch.core;
 
+import java.time.Duration;
 import java.util.Iterator;
 import java.util.List;
 import java.util.NoSuchElementException;
@@ -22,8 +23,8 @@ import java.util.concurrent.atomic.AtomicInteger;
 import java.util.function.Consumer;
 import java.util.function.Function;
 
+import org.jspecify.annotations.Nullable;
 import org.springframework.data.elasticsearch.client.util.ScrollState;
-import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**
@@ -31,6 +32,7 @@ import org.springframework.util.Assert;
  *
  * @author Mark Paluch
  * @author Sascha Woo
+ * @author Mohamed El Harrougui
  * @since 3.2
  */
 abstract class StreamQueries {
@@ -56,6 +58,7 @@ abstract class StreamQueries {
 
 		AggregationsContainer<?> aggregations = searchHits.getAggregations();
 		float maxScore = searchHits.getMaxScore();
+		Duration executionDuration = searchHits.getExecutionDuration();
 		long totalHits = searchHits.getTotalHits();
 		TotalHitsRelation totalHitsRelation = searchHits.getTotalHitsRelation();
 
@@ -86,6 +89,11 @@ abstract class StreamQueries {
 				return maxScore;
 			}
 
+			@Override
+			public Duration getExecutionDuration() {
+				return executionDuration;
+			}
+
 			@Override
 			public long getTotalHits() {
 				return totalHits;

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

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

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

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

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

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