Backport multiple PRs to 2.x from main

[rbhavna]

Description

Backporting below PRs to 2.x from main:
#1250
#1278
#1409
#1579
#1610
#1670

Issues Resolved

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

Attention: 95 lines in your changes are missing coverage. Please review.

Comparison is base (df5e065) 80.77% compared to head (acac60f) 80.76%.

Files	Patch %	Lines
...rithms/metrics_correlation/MetricsCorrelation.java	14.00%	41 Missing and 2 partials ⚠️
.../ml/engine/algorithms/clustering/RCFSummarize.java	78.94%	7 Missing and 1 partial ⚠️
...tion/model_group/GetModelGroupTransportAction.java	84.09%	6 Missing and 1 partial ⚠️
...ain/java/org/opensearch/ml/engine/ModelHelper.java	66.66%	4 Missing and 1 partial ⚠️
...ch/ml/engine/algorithms/remote/ConnectorUtils.java	68.75%	2 Missing and 3 partials ⚠️
..._embedding/HuggingfaceTextEmbeddingTranslator.java	33.33%	4 Missing ⚠️
...gine/algorithms/tokenize/SparseTokenizerModel.java	78.57%	2 Missing and 1 partial ⚠️
...n/transport/model_group/MLModelGroupGetAction.java	0.00%	2 Missing ⚠️
...l/engine/algorithms/ad/AnomalyDetectionLibSVM.java	87.50%	0 Missing and 2 partials ⚠️
...thms/anomalylocalization/AnomalyLocalizerImpl.java	96.66%	0 Missing and 2 partials ⚠️
... and 12 more

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #1705      +/-   ##
============================================
- Coverage     80.77%   80.76%   -0.01%     
- Complexity     4188     4216      +28     
============================================
  Files           399      404       +5     
  Lines         16845    16994     +149     
  Branches       1816     1819       +3     
============================================
+ Hits          13607    13726     +119     
- Misses         2524     2552      +28     
- Partials        714      716       +2     

Flag	Coverage Δ
ml-commons	80.76% <83.84%> (-0.01%)	⬇️

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