[Backport 2.x] Star Tree File Formats

[opensearch-trigger-bot]

Backport 6bae704 from #14809.

[github-actions]

❕ Gradle check result for a9eae9d: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.remotestore.multipart.RemoteStoreMultipartIT.testOverriddenBufferInterval
      1 org.opensearch.cluster.MinimumClusterManagerNodesIT.testThreeNodesNoClusterManagerBlock

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 89.72746% with 49 lines in your changes missing coverage. Please review.

Project coverage is 71.72%. Comparing base (2a2fcbd) to head (a9eae9d).
Report is 3 commits behind head on 2.x.

Files with missing lines	Patch %	Lines
...posite/composite99/Composite99DocValuesReader.java	77.10%	11 Missing and 8 partials ⚠️
...eindex/datacube/startree/index/StarTreeValues.java	81.53%	7 Missing and 5 partials ⚠️
...datacube/startree/builder/BaseStarTreeBuilder.java	96.12%	3 Missing and 3 partials ⚠️
...index/datacube/startree/node/InMemoryTreeNode.java	88.46%	0 Missing and 6 partials ⚠️
...posite/composite99/Composite99DocValuesWriter.java	93.47%	1 Missing and 2 partials ⚠️
...tacube/startree/builder/OnHeapStarTreeBuilder.java	92.30%	1 Missing ⚠️
.../startree/fileformats/data/StarTreeDataWriter.java	93.33%	0 Missing and 1 partial ⚠️
...rtree/fileformats/meta/StarTreeMetadataWriter.java	83.33%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #15574      +/-   ##
============================================
+ Coverage     71.60%   71.72%   +0.12%     
- Complexity    63794    63937     +143     
============================================
  Files          5240     5240              
  Lines        298595   298887     +292     
  Branches      43472    43509      +37     
============================================
+ Hits         213816   214386     +570     
+ Misses        66860    66649     -211     
+ Partials      17919    17852      -67     

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