fixing metrics correlation algorithm

[dhrubo-os]

Description

[We recently moved our index mapping in json file. That change broke this functionality as model group index wasn't able to be created from the index mapping.

This PR fixes that issue.
]

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

• New functionality includes testing.
• New functionality has been documented.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

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[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.93%. Comparing base (266bcfe) to head (f1d2dee).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...rithms/metrics_correlation/MetricsCorrelation.java	50.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4200      +/-   ##
============================================
- Coverage     82.01%   81.93%   -0.09%     
+ Complexity     9196     9195       -1     
============================================
  Files           789      789              
  Lines         39618    39621       +3     
  Branches       4394     4394              
============================================
- Hits          32494    32464      -30     
- Misses         5233     5277      +44     
+ Partials       1891     1880      -11     

Flag	Coverage Δ
ml-commons	81.93% <50.00%> (-0.09%)	⬇️

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[xinyual]

LGTM

[jackiehanyang]

thank you for the change Dhrubo! It seems like code coverage failed, lgtm other than that