Remote fallback

[rajiv-kv]

Description

[Describe what this change achieves]

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 87102d9: 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 8654505: 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 b8ca1d7: 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 b47872d: 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 baa5034: UNSTABLE

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 60.86957% with 27 lines in your changes missing coverage. Please review.

Project coverage is 71.90%. Comparing base (dac6460) to head (baa5034).
Report is 125 commits behind head on main.

Files with missing lines	Patch %	Lines
...stermanager/TransportClusterManagerNodeAction.java	34.78%	13 Missing and 2 partials ⚠️
...arch/gateway/remote/RemoteClusterStateService.java	66.66%	9 Missing and 2 partials ⚠️
...nsearch/cluster/service/ClusterApplierService.java	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #15382      +/-   ##
============================================
+ Coverage     71.83%   71.90%   +0.06%     
- Complexity    63174    63247      +73     
============================================
  Files          5224     5224              
  Lines        296078   296142      +64     
  Branches      42763    42772       +9     
============================================
+ Hits         212702   212937     +235     
+ Misses        65902    65698     -204     
- Partials      17474    17507      +33     

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