[Backport 2.x] Support cancellation for admin apis (#13966)

[aasom143]

• Support cancellation for admin apis - add implementation for _cat/shards

Signed-off-by: Somesh Gupta [email protected]
(cherry picked from commit 9f81479)

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 b0794ec: 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 93ae032: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 31.25000% with 77 lines in your changes missing coverage. Please review.

Project coverage is 71.67%. Comparing base (dbdc151) to head (93ae032).
Report is 2 commits behind head on 2.x.

Files with missing lines	Patch %	Lines
...admin/cluster/shards/TransportCatShardsAction.java	9.09%	40 Missing ⚠️
...action/support/TimeoutTaskCancellationUtility.java	12.50%	6 Missing and 1 partial ⚠️
.../action/admin/cluster/shards/CatShardsRequest.java	45.45%	6 Missing ⚠️
...action/admin/cluster/shards/CatShardsResponse.java	64.28%	5 Missing ⚠️
...ch/rest/action/admin/cluster/ClusterAdminTask.java	0.00%	5 Missing ⚠️
...g/opensearch/rest/action/cat/RestShardsAction.java	50.00%	5 Missing ⚠️
...ction/admin/cluster/state/ClusterStateRequest.java	33.33%	1 Missing and 1 partial ⚠️
...ction/admin/indices/stats/IndicesStatsRequest.java	33.33%	1 Missing and 1 partial ⚠️
...rch/action/support/broadcast/BroadcastRequest.java	50.00%	2 Missing ⚠️
.../clustermanager/ClusterManagerNodeReadRequest.java	50.00%	2 Missing ⚠️
... and 1 more

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #15594      +/-   ##
============================================
- Coverage     71.75%   71.67%   -0.09%     
- Complexity    63980    63991      +11     
============================================
  Files          5239     5244       +5     
  Lines        299084   299174      +90     
  Branches      43540    43540              
============================================
- Hits         214617   214432     -185     
- Misses        66516    66844     +328     
+ Partials      17951    17898      -53     

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