[Backport 2.x] pluggable deciders for concurrent search (#15363)

[Gankris96]

Signed-off-by: Ganesh Ramadurai [email protected]
Signed-off-by: Jay Deng [email protected]
Co-authored-by: Jay Deng [email protected]

(cherry picked from commit 442a928)

Description

Backport of PR #15363

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 21c6d82: 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 bab8b5e: 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 e2f0fc6: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 22 lines in your changes missing coverage. Please review.

Project coverage is 71.63%. Comparing base (d000171) to head (e2f0fc6).
Report is 1 commits behind head on 2.x.

Files with missing lines	Patch %	Lines
...va/org/opensearch/search/DefaultSearchContext.java	76.47%	4 Missing and 8 partials ⚠️
...arch/search/deciders/ConcurrentSearchDecision.java	86.95%	2 Missing and 1 partial ⚠️
.../main/java/org/opensearch/index/IndexSettings.java	60.00%	1 Missing and 1 partial ⚠️
...main/java/org/opensearch/search/SearchService.java	66.66%	1 Missing and 1 partial ⚠️
...search/common/settings/AbstractScopedSettings.java	93.33%	0 Missing and 1 partial ⚠️
...earch/search/deciders/ConcurrentSearchDecider.java	0.00%	1 Missing ⚠️
...earch/search/deciders/ConcurrentSearchVisitor.java	87.50%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #15630      +/-   ##
============================================
- Coverage     71.78%   71.63%   -0.15%     
+ Complexity    64073    64012      -61     
============================================
  Files          5244     5247       +3     
  Lines        299367   299480     +113     
  Branches      43575    43603      +28     
============================================
- Hits         214886   214528     -358     
- Misses        66497    67015     +518     
+ Partials      17984    17937      -47     

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