[Backport 2.x] Addresses changes related to default admin credentials

[opensearch-trigger-bot]

Backport ea3dc80 from #832

[codecov]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (bd2ad2b) 24.86% compared to head (b3734e7) 24.87%.
Report is 2 commits behind head on 2.x.

Files	Patch %	Lines
...ytics/transport/TransportDeleteDetectorAction.java	0.00%	13 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x     #836      +/-   ##
============================================
+ Coverage     24.86%   24.87%   +0.01%     
- Complexity     1021     1024       +3     
============================================
  Files           277      277              
  Lines         12656    12662       +6     
  Branches       1390     1390              
============================================
+ Hits           3147     3150       +3     
- Misses         9242     9246       +4     
+ Partials        267      266       -1     

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