[Backport 2.17] Optimize NodeIndicesStats output behind flag

[Pranshu-S]

Backport e146f13 from #14454.

[github-actions]

❌ Gradle check result for e21cc30: null

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 0a27d7e: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.gateway.RecoveryFromGatewayIT.testShardStoreFetchMultiNodeMultiIndexesUsingBatchAction

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[codecov]

Codecov Report

Attention: Patch coverage is 81.63265% with 18 lines in your changes missing coverage. Please review.

Project coverage is 71.72%. Comparing base (bd5041f) to head (0a27d7e).
Report is 7 commits behind head on 2.17.

Files with missing lines	Patch %	Lines
.../java/org/opensearch/indices/NodeIndicesStats.java	85.71%	7 Missing and 5 partials ⚠️
...in/java/org/opensearch/indices/IndicesService.java	25.00%	2 Missing and 1 partial ⚠️
...h/action/admin/indices/stats/CommonStatsFlags.java	75.00%	0 Missing and 2 partials ⚠️
...rg/opensearch/rest/action/cat/RestNodesAction.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               2.17   #15678      +/-   ##
============================================
- Coverage     71.77%   71.72%   -0.05%     
+ Complexity    64298    64270      -28     
============================================
  Files          5251     5251              
  Lines        300482   300557      +75     
  Branches      43724    43743      +19     
============================================
- Hits         215672   215582      -90     
- Misses        66760    66931     +171     
+ Partials      18050    18044       -6     

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