[Backport 2.17] Schedule reroute after allocator timed out

[imRishN]

• Schedule reroute after allocator timed out

Description

Backport #15565

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 7fa2edb: null

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 7fa2edb: null

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 c1f6471: null

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 7fa2edb: 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 c1f6471: 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 78.12500% with 7 lines in your changes missing coverage. Please review.

Project coverage is 71.71%. Comparing base (ccae165) to head (c1f6471).
Report is 18 commits behind head on 2.17.

Files with missing lines	Patch %	Lines
...pensearch/gateway/ShardsBatchGatewayAllocator.java	76.47%	0 Missing and 4 partials ⚠️
.../allocation/allocator/BalancedShardsAllocator.java	81.81%	0 Missing and 2 partials ⚠️
.../routing/allocation/allocator/ShardsAllocator.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               2.17   #15687      +/-   ##
============================================
- Coverage     71.73%   71.71%   -0.03%     
+ Complexity    64250    64244       -6     
============================================
  Files          5251     5252       +1     
  Lines        300362   300391      +29     
  Branches      43704    43709       +5     
============================================
- Hits         215471   215413      -58     
- Misses        66908    66983      +75     
- Partials      17983    17995      +12     

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