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

Bumps [co.elastic.clients:elasticsearch-java](https://github.com/elastic/elasticsearch-java) from 8.17.0 to 9.5.0.
- [Release notes](https://github.com/elastic/elasticsearch-java/releases)
- [Changelog](https://github.com/elastic/elasticsearch-java/blob/main/CHANGELOG.md)
- [Commits](elastic/elasticsearch-java@v8.17.0...v9.5.0)

---
updated-dependencies:
- dependency-name: co.elastic.clients:elasticsearch-java
  dependency-version: 9.5.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

backend/pom.xml

@@ -291,7 +291,7 @@
         <dependency>
             <groupId>co.elastic.clients</groupId>
             <artifactId>elasticsearch-java</artifactId>
-            <version>8.17.0</version>
+            <version>9.5.0</version>
         </dependency>
 
         <!-- JSQLParser for SQL parsing -->