[Backport 2.x] Fix for reroute operation during node-left

[opensearch-trigger-bot]

Backport 9f7d3b6 from #16468.

[github-actions]

❌ Gradle check result for 7f1c0cc: 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 7f1c0cc: 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 7f1c0cc: 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 77.77778% with 4 lines in your changes missing coverage. Please review.

Project coverage is 71.86%. Comparing base (c26a49e) to head (7f1c0cc).
Report is 13 commits behind head on 2.x.

Files with missing lines	Patch %	Lines
...opensearch/gateway/ReplicaShardBatchAllocator.java	76.92%	2 Missing and 1 partial ⚠️
...a/org/opensearch/gateway/AsyncShardBatchFetch.java	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #16507      +/-   ##
============================================
+ Coverage     71.83%   71.86%   +0.03%     
- Complexity    65318    65404      +86     
============================================
  Files          5312     5312              
  Lines        304985   305002      +17     
  Branches      44436    44439       +3     
============================================
+ Hits         219079   219188     +109     
+ Misses        67609    67516      -93     
- Partials      18297    18298       +1     

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