[Backport 2.16] Optimising hashmap.get call inside AwarenessAllocationDecider

[opensearch-trigger-bot]

Backport e46d1d8 from #14761.

[github-actions]

❌ Gradle check result for de8fb1c: 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 de8fb1c: 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?

[Bukhtawar]

Test Result (1 failure / ±0)
org.opensearch.action.admin.indices.create.RemoteCloneIndexIT.testCreateCloneIndexLowPriorityRateLimit

[github-actions]

✅ Gradle check result for de8fb1c: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 82.60870% with 4 lines in your changes missing coverage. Please review.

Project coverage is 71.64%. Comparing base (1c28e4e) to head (de8fb1c).
Report is 8 commits behind head on 2.16.

Files	Patch %	Lines
...allocation/decider/AwarenessAllocationDecider.java	82.60%	0 Missing and 4 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               2.16   #14920      +/-   ##
============================================
+ Coverage     71.55%   71.64%   +0.09%     
- Complexity    62652    62663      +11     
============================================
  Files          5117     5117              
  Lines        293928   294056     +128     
  Branches      42833    42850      +17     
============================================
+ Hits         210319   210677     +358     
+ Misses        65975    65671     -304     
- Partials      17634    17708      +74     

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