Upgrade to Elasticsearch 8.8.0.

Original Pull Request #2582
Closes #2577

pom.xml

@@ -21,7 +21,7 @@
 				<springdata.commons>3.2.0-SNAPSHOT</springdata.commons>
 
 				<!-- version of the ElasticsearchClient	-->
-				<elasticsearch-java>8.7.1</elasticsearch-java>
+				<elasticsearch-java>8.8.0</elasticsearch-java>
 
 				<blockhound-junit>1.0.8.RELEASE</blockhound-junit>
 				<hoverfly>0.14.4</hoverfly>

src/main/asciidoc/preface.adoc

@@ -37,7 +37,7 @@ built and tested.
 [cols="^,^,^,^,^",options="header"]
 |===
 | Spring Data Release Train | Spring Data Elasticsearch | Elasticsearch | Spring Framework | Spring Boot
-| 2023.1 (?) | 5.2.x | 8.7.1 | 6.0.x | 3.1.x
+| 2023.1 (?) | 5.2.x | 8.8.0 | 6.0.x | 3.1.x
 | 2023.0 (Ullmann) | 5.1.x | 8.7.1 | 6.0.x | 3.1.x
 | 2022.0 (Turing) | 5.0.x | 8.5.3 | 6.0.x | 3.0.x
 | 2021.2 (Raj) | 4.4.xfootnote:oom[Out of maintenance] | 7.17.3 | 5.3.x | 2.7.x

src/main/asciidoc/reference/elasticsearch-new.adoc

@@ -4,7 +4,7 @@
 [[new-features.5-2-0]]
 == New in Spring Data Elasticsearch 5.2
 
-* Upgrade to Elasticsearch 8.7.1
+* Upgrade to Elasticsearch 8.8.0
 
 [[new-features.5-1-0]]
 == New in Spring Data Elasticsearch 5.1

src/test/resources/testcontainers-elasticsearch.properties

@@ -15,7 +15,7 @@
 #
 #
 sde.testcontainers.image-name=docker.elastic.co/elasticsearch/elasticsearch
-sde.testcontainers.image-version=8.7.1
+sde.testcontainers.image-version=8.8.0
 #
 #
 # needed as we do a DELETE /* at the end of the tests, will be required from 8.0 on, produces a warning since 7.13