[Backport 2.17] [Dynamic Config] Fix bug when attempting dynamic config index creation

[opensearch-trigger-bot]

Backport 678c644 from #8184.

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 96.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 63.93%. Comparing base (2fc39e8) to head (ea858bc).
Report is 1 commits behind head on 2.17.

Files with missing lines	Patch %	Lines
...fig_store_client/opensearch_config_store_client.ts	95.45%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             2.17    #8193      +/-   ##
==========================================
+ Coverage   63.92%   63.93%   +0.01%     
==========================================
  Files        3737     3737              
  Lines       88728    88754      +26     
  Branches    13796    13804       +8     
==========================================
+ Hits        56720    56746      +26     
  Misses      31410    31410              
  Partials      598      598              

Flag	Coverage Δ
Linux_1	29.95% <6.66%> (-0.01%)	⬇️
Linux_2	58.95% <96.66%> (+0.03%)	⬆️
Linux_3	40.27% <6.66%> (-0.02%)	⬇️
Linux_4	31.32% <6.66%> (-0.02%)	⬇️
Windows_1	29.97% <6.66%> (-0.01%)	⬇️
Windows_2	58.89% <96.66%> (+0.03%)	⬆️
Windows_3	40.27% <6.66%> (-0.02%)	⬇️
Windows_4	31.32% <6.66%> (-0.02%)	⬇️

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