Is your feature request related to a problem? Please describe.

The Data Prepper project is not running tests against OpenSearch 3. While I don't know of specific issues, we should verify the behavior to claim official support.

Describe the solution you'd like

Run integration tests against OpenSearch 3.0 and 3.4 (current latest). Fix any issues which arise.

Describe alternatives you've considered (Optional)

N/A

Additional context

N/A