[Backport 2.x] Fix flaky faiss integration tests

[opensearch-trigger-bot]

Backport 730b7e4 from #1635

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.89%. Comparing base (551068b) to head (23d1e23).
Report is 8 commits behind head on 2.x.

❗ Current head 23d1e23 differs from pull request most recent head 34c38a7. Consider uploading reports for the commit 34c38a7 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #1637      +/-   ##
============================================
+ Coverage     84.86%   84.89%   +0.03%     
- Complexity     1343     1446     +103     
============================================
  Files           167      175       +8     
  Lines          5516     5852     +336     
  Branches        548      600      +52     
============================================
+ Hits           4681     4968     +287     
- Misses          602      633      +31     
- Partials        233      251      +18     

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