Bump org.opensearch.client:opensearch-java from 2.11.1 to 2.12.0

Bumps [org.opensearch.client:opensearch-java](https://github.com/opensearch-project/opensearch-java) from 2.11.1 to 2.12.0.
- [Release notes](https://github.com/opensearch-project/opensearch-java/releases)
- [Changelog](https://github.com/opensearch-project/opensearch-java/blob/main/CHANGELOG.md)
- [Commits](opensearch-project/opensearch-java@v2.11.1...v2.12.0)

---
updated-dependencies:
- dependency-name: org.opensearch.client:opensearch-java
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -429,7 +429,7 @@ under the License.
 
     <elasticsearch.version>8.14.3</elasticsearch.version>
     <opensearch.version>2.15.0</opensearch.version>
-    <opensearch-java.version>2.11.1</opensearch-java.version>
+    <opensearch-java.version>2.12.0</opensearch-java.version>
 
     <commons-lang3.version>3.15.0</commons-lang3.version>
     <commons-jexl.version>3.4.0</commons-jexl.version>