Elasticsearch java client migration to 8.15

Description:

• Elasticsearch java client migration to 8.15
• Minor fix for info endpoint, to return elasticsearch version, not lucene engine one

How to test:

Integration tests and info endpoint

{
    "groupId": "org.opengroup.osdu",
    "artifactId": "search-gc",
    "version": "0.28.0-SNAPSHOT",
    "buildTime": "2024-10-21T15:10:27.392Z",
    "branch": "trusted-elasticsearch8-java-client",
    "commitId": "fbc2b5278c3680cc9862e690fdd49cb56ecd19ea",
    "commitMessage": "Fix elastic secret",
    "connectedOuterServices": [
        {
            "name": "Redis-RedisCacheBuilder$2",
            "version": "7.2.6"
        },
        {
            "name": "ElasticSearch-osdu",
            "version": "8.15.3"
        },
        {
            "name": "ElasticSearch-second",
            "version": "8.15.3"
        }
    ]
}

Changes include:

• Refactor (a non-breaking change that improves code maintainability).
• Bugfix (a non-breaking change that solves an issue).
• New feature (a non-breaking change that adds functionality).
• Breaking change (a change that is not backward-compatible and/or changes current functionality).

Changes in:

• Core

Dev Checklist:

• Added Unit Tests, wherever applicable.
• Updated the Readme, if applicable.
• Existing Tests pass
• Verified functionality locally
• Self Reviewed my code for formatting and complex business logic.

Other comments:

Any comments to approvers here