[Backport 2.x] fix bedrock embedding model blueprint

[opensearch-trigger-bot]

Backport 012cc6c from #1562

[codecov]

Codecov Report

Merging #1563 (6f9629b) into 2.x (dd5b7a6) will decrease coverage by 0.01%.
Report is 2 commits behind head on 2.x.
The diff coverage is 62.50%.

@@             Coverage Diff              @@
##                2.x    #1563      +/-   ##
============================================
- Coverage     80.26%   80.25%   -0.01%     
- Complexity     2525     2527       +2     
============================================
  Files           199      199              
  Lines         10007    10008       +1     
  Branches       1002     1002              
============================================
  Hits           8032     8032              
  Misses         1504     1504              
- Partials        471      472       +1     

Flag	Coverage Δ
ml-commons	80.25% <62.50%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...pensearch/ml/client/MachineLearningNodeClient.java	98.18% <100.00%> (+0.03%)	⬆️
...org/opensearch/ml/rest/RestMLPredictionAction.java	51.21% <0.00%> (+1.21%)	⬆️

... and 1 file with indirect coverage changes