[Backport 2.x] Enable SearchableSnapshotIT to run during build

[opensearch-trigger-bot]

Backport 901cd69 from #5937.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/9608/
• CommitID: b014bb7
  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?

[kotwanikunal]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/9608/
• CommitID: b014bb7
  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?

 java.lang.IllegalArgumentException: unknown setting [opensearch.experimental.feature.searchable_snapshot.enabled] please check that any required plugins are installed, or check the breaking changes documentation for removed settings

Looks like the feature flag code needs to be backported before we can merge this in.

[kotwanikunal]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/9608/
• CommitID: b014bb7
  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?

 java.lang.IllegalArgumentException: unknown setting [opensearch.experimental.feature.searchable_snapshot.enabled] please check that any required plugins are installed, or check the breaking changes documentation for removed settings

Looks like the feature flag code needs to be backported before we can merge this in.

Found the backport PR - #5707

[kotwanikunal]

Rebased backport/backport-5937-to-2.x on 2.x.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      1 org.opensearch.indices.replication.SegmentReplicationIT.testReplicationAfterPrimaryRefreshAndFlush

• URL: https://build.ci.opensearch.org/job/gradle-check/9620/
• CommitID: bf32962
  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-commenter]

Codecov Report

Merging #5939 (bf32962) into 2.x (cdb2b26) will decrease coverage by 0.11%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #5939      +/-   ##
============================================
- Coverage     70.49%   70.38%   -0.11%     
- Complexity    58887    58900      +13     
============================================
  Files          4766     4766              
  Lines        282418   282418              
  Branches      41130    41130              
============================================
- Hits         199077   198774     -303     
- Misses        66670    67018     +348     
+ Partials      16671    16626      -45     

Impacted Files	Coverage Δ
...adonly/AddIndexBlockClusterStateUpdateRequest.java	0.00% <0.00%> (-75.00%)	⬇️
...port/ResponseHandlerFailureTransportException.java	0.00% <0.00%> (-60.00%)	⬇️
...readonly/TransportVerifyShardIndexBlockAction.java	9.75% <0.00%> (-58.54%)	⬇️
...ch/transport/ReceiveTimeoutTransportException.java	50.00% <0.00%> (-50.00%)	⬇️
...cluster/coordination/PendingClusterStateStats.java	20.00% <0.00%> (-48.00%)	⬇️
...adcast/BroadcastShardOperationFailedException.java	55.55% <0.00%> (-44.45%)	⬇️
...pensearch/indices/breaker/CircuitBreakerStats.java	27.77% <0.00%> (-41.67%)	⬇️
.../admin/cluster/reroute/ClusterRerouteResponse.java	60.00% <0.00%> (-40.00%)	⬇️
...indices/readonly/TransportAddIndexBlockAction.java	20.68% <0.00%> (-37.94%)	⬇️
...luster/routing/allocation/RoutingExplanations.java	62.06% <0.00%> (-37.94%)	⬇️
... and 501 more

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