[Backport-2.x] Cluster State Update Optimization (#7853)

[sandeshkr419]

• Cluster State Update Optimization - Optimize Metadata build() to skip redundant computations of indicesLookup as part of ClusterState build

Signed-off-by: Sandesh Kumar sandeshkr419@gmail.com

---

Signed-off-by: Sandesh Kumar sandeshkr419@gmail.com
(cherry picked from commit cb0d13b)

Description

Backporting #7853 to 2.x branch

Related Issues

Resolves #7002

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      1 org.opensearch.remotestore.SegmentReplicationRemoteStoreIT.testCancellation
      1 org.opensearch.indices.replication.SegmentReplicationIT.testScrollCreatedOnReplica
      1 org.opensearch.cluster.allocation.AwarenessAllocationIT.testThreeZoneOneReplicaWithForceZoneValueAndLoadAwareness

• URL: https://build.ci.opensearch.org/job/gradle-check/19978/
• CommitID: 61c23f6
  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

Merging #8644 (61c23f6) into 2.x (b8cebf4) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                2.x    #8644      +/-   ##
============================================
+ Coverage     70.55%   70.58%   +0.02%     
- Complexity    57076    57097      +21     
============================================
  Files          4745     4745              
  Lines        270757   270777      +20     
  Branches      39961    39967       +6     
============================================
+ Hits         191033   191117      +84     
+ Misses        63270    63212      -58     
+ Partials      16454    16448       -6     

Impacted Files	Coverage Δ
...java/org/opensearch/cluster/metadata/Metadata.java	87.03% <100.00%> (-0.18%)	⬇️

... and 455 files with indirect coverage changes