[Backport 2.x] Make the HitQueue size more appropriate for exact search

[opensearch-trigger-bot]

Backport c861966 from #1549

[navneet1v]

The PR for 2.14 upgrade : #1574 is still open. Once that PR is merged I will merge this PR to 2.x

@bugmakerrrrrr

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 84.88%. Comparing base (3ec60af) to head (ec79a45).

Files	Patch %	Lines
...java/org/opensearch/knn/index/query/KNNWeight.java	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #1580      +/-   ##
============================================
- Coverage     84.97%   84.88%   -0.10%     
  Complexity     1343     1343              
============================================
  Files           167      167              
  Lines          5510     5510              
  Branches        548      548              
============================================
- Hits           4682     4677       -5     
- Misses          595      600       +5     
  Partials        233      233              

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