Add changes to support pinning in FileCache

[mayanksharma27]

Description

Add changes to support pinning in FileCache

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

• resolves [Writable Warm] File Pinning support in FileCache #13648
• Meta Issue [META] Writable Warm Index #13149

Check List

• [Y ] Functionality includes testing.
• [NA] API changes companion pull request created, if applicable.
• [NA] Public documentation issue/PR created, if applicable.

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[github-actions]

❌ Gradle check result for 353bcdf: 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?

[github-actions]

❌ Gradle check result for 97de675: 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?

[github-actions]

❌ Gradle check result for 80062af: 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?

[github-actions]

✅ Gradle check result for 80062af: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 73.23944% with 38 lines in your changes missing coverage. Please review.

Project coverage is 72.65%. Comparing base (aec3fe9) to head (80062af).
Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
...search/index/store/remote/filecache/FileCache.java	33.33%	12 Missing ⚠️
...earch/index/store/remote/utils/cache/LRUCache.java	78.04%	4 Missing and 5 partials ⚠️
...index/store/remote/utils/cache/SegmentedCache.java	58.82%	5 Missing and 2 partials ⚠️
...ils/cache/stats/AggregateRefCountedCacheStats.java	42.85%	4 Missing ⚠️
...ore/remote/utils/cache/stats/FileStatsCounter.java	87.87%	2 Missing and 2 partials ⚠️
.../remote/utils/cache/stats/DefaultStatsCounter.java	71.42%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #17617      +/-   ##
============================================
+ Coverage     72.52%   72.65%   +0.13%     
- Complexity    67496    67552      +56     
============================================
  Files          5495     5495              
  Lines        311433   311537     +104     
  Branches      45249    45263      +14     
============================================
+ Hits         225867   226355     +488     
+ Misses        67179    66703     -476     
- Partials      18387    18479      +92     

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[rayshrey]

LGTM