[Backport 2.17] [Backport 2.x] Introduce allocation filter to control placement of search only replicas

[opensearch-trigger-bot]

Backport b44242d from #15702.

[github-actions]

❕ Gradle check result for 8027256: 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 95.65217% with 1 line in your changes missing coverage. Please review.

Project coverage is 71.64%. Comparing base (bd5041f) to head (8027256).
Report is 5 commits behind head on 2.17.

Files with missing lines	Patch %	Lines
...cation/decider/SearchReplicaAllocationDecider.java	94.73%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               2.17   #15711      +/-   ##
============================================
- Coverage     71.77%   71.64%   -0.13%     
+ Complexity    64298    64278      -20     
============================================
  Files          5251     5262      +11     
  Lines        300482   300926     +444     
  Branches      43724    43802      +78     
============================================
- Hits         215672   215609      -63     
- Misses        66760    67225     +465     
- Partials      18050    18092      +42     

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