Hashed prefix for index metadata

[soosinha]

Description

Adding hashed prefix for remote index metadata files. This is required for better partitioning in backing data store.

Related Issues

NA

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 0d7845f: 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 5bf8aa4: 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 5dad535: 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?

[soosinha]

Flaky test: #15117

[github-actions]

❕ Gradle check result for 8f80e58: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.remotestore.RemoteStoreStatsIT.testDownloadStatsCorrectnessSinglePrimaryMultipleReplicaShards
      1 org.opensearch.http.SearchRestCancellationIT.testAutomaticCancellationMultiSearchDuringQueryPhase
      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 96.42857% with 1 line in your changes missing coverage. Please review.

Project coverage is 71.93%. Comparing base (46a269e) to head (8f80e58).
Report is 58 commits behind head on main.

Files with missing lines	Patch %	Lines
...arch/gateway/remote/model/RemoteIndexMetadata.java	88.88%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #15476      +/-   ##
============================================
+ Coverage     71.88%   71.93%   +0.04%     
- Complexity    63242    63318      +76     
============================================
  Files          5224     5224              
  Lines        296137   296163      +26     
  Branches      42777    42778       +1     
============================================
+ Hits         212881   213039     +158     
+ Misses        65784    65685      -99     
+ Partials      17472    17439      -33     

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[Bukhtawar]

Do we need the same changes for index routing table as well to keep interfaces consistent?

[soosinha]

I was thinking of deleting the RemoteRoutingTableBlobStore class itself as that was created to add the hashed prefix itself. But I would rather do that in a follow up PR.

[soosinha]

Closing in favour of #15575