chore(deps): bump co.elastic.clients:elasticsearch-java

Bumps [co.elastic.clients:elasticsearch-java](https://github.com/elastic/elasticsearch-java) from 7.17.18 to 8.15.3.
- [Release notes](https://github.com/elastic/elasticsearch-java/releases)
- [Changelog](https://github.com/elastic/elasticsearch-java/blob/main/CHANGELOG.md)
- [Commits](elastic/elasticsearch-java@v7.17.18...v8.15.3)

---
updated-dependencies:
- dependency-name: co.elastic.clients:elasticsearch-java
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

build.gradle

@@ -59,7 +59,7 @@ wrapper {
 ext {
     kafkaVersion = "2.2.0"
     slf4jVersion = "2.0.12"
-    elasticJavaClientVersion = "7.17.18"
+    elasticJavaClientVersion = "8.15.3"
     testContainersElasticVersion = "1.20.3"
     carrotsearchVersion = "2.8.1"
 }