Optimise memory for rest cluster health calls with in-line shard aggr…

[SwethaGuptha]

…egations for levels cluster and indices. (#15492)

Description

Backport #15492 to 2.x

Related Issues

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

Check List

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

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[github-actions]

❌ Gradle check result for e5c0779: 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 e5c0779: TIMEOUT

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 e5c0779: 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?

[jed326]

❌ Gradle check result for e5c0779: 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?

• [BUG] DeleteSnapshotITV2.testRemoteStoreCleanupForDeletedIndexForSnapshotV2 test failure #15692
• [AUTOCUT] Gradle Check Flaky Test Report for DeleteSnapshotITV2 #15808

[github-actions]

❌ Gradle check result for e5c0779: 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?

[jed326]

@SwethaGuptha looks like DCO is wrong on this one

[github-actions]

✅ Gradle check result for f99e8f3: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 93.37017% with 12 lines in your changes missing coverage. Please review.

Project coverage is 71.71%. Comparing base (a24c858) to head (a76ccb9).
Report is 1 commits behind head on 2.x.

Files with missing lines	Patch %	Lines
...on/admin/cluster/health/ClusterHealthResponse.java	64.28%	4 Missing and 1 partial ⚠️
.../opensearch/cluster/health/ClusterIndexHealth.java	94.44%	1 Missing and 3 partials ⚠️
...in/cluster/health/ClusterHealthRequestBuilder.java	0.00%	2 Missing ⚠️
.../opensearch/cluster/health/ClusterShardHealth.java	93.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #15802      +/-   ##
============================================
+ Coverage     71.63%   71.71%   +0.07%     
- Complexity    64400    64490      +90     
============================================
  Files          5263     5263              
  Lines        301528   301684     +156     
  Branches      43903    43927      +24     
============================================
+ Hits         216002   216351     +349     
+ Misses        67404    67214     -190     
+ Partials      18122    18119       -3     

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[github-actions]

✅ Gradle check result for a76ccb9: SUCCESS