Exposing a cache type setting and integrating it with IndicesRequestC…

[sgup432]

Description

Exposes a cache type setting for IndicesRequestCache which can be set by user. For now, integrating only onHeap. When tiered cache are changes are done, it will added later. This setting is being as added like a feature flag as it is meant to be experimental in initial phase.

Related Issues

Resolves https://github.com/opensearch-project/OpenSearch/issues/11947

Check List

• [x] New functionality includes testing.
  • [x] All tests pass
• [x] New functionality has been documented.
  • [x] New functionality has javadoc added
• [ ] Failing checks are inspected and point to the corresponding known issue(s) (See: Troubleshooting Failing Builds)
• [x] Commits are signed per the DCO using --signoff
• [ ] Commit changes are listed out in CHANGELOG.md file (See: Changelog)
• [] Public documentation issue/PR created

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[github-actions[bot]]

Compatibility status:

Checks if related components are compatible with change 291874b

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[github-actions[bot]]

:x: Gradle check result for 28ffcf14c9396bf905c81172d73dc365e93ddb9b: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[deshsidd]

Looks like build is failing and please add changelog

[github-actions[bot]]

:x: Gradle check result for 291874b71fa348dac58b0719d34317ceef94de48: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?