[Backport 2.x] fixing connector validation

[opensearch-trigger-bot]

Backport a6eaf08 from #3461

[codecov]

Codecov Report

Attention: Patch coverage is 10.00000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 80.20%. Comparing base (66aa200) to head (fe96bb7).
Report is 180 commits behind head on 2.x.

Files with missing lines	Patch %	Lines
.../action/register/TransportRegisterModelAction.java	10.00%	8 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #3470      +/-   ##
============================================
- Coverage     81.34%   80.20%   -1.15%     
- Complexity     6105     6885     +780     
============================================
  Files           573      608      +35     
  Lines         25311    30016    +4705     
  Branches       2665     3356     +691     
============================================
+ Hits          20590    24075    +3485     
- Misses         3603     4497     +894     
- Partials       1118     1444     +326     

Flag	Coverage Δ
ml-commons	80.20% <10.00%> (-1.15%)	⬇️

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