throw exception when model group not found during update request

[rbhavna]

Description

throw exception when model group not found during update request

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

Merging #1447 (4cf256b) into 2.x (1f43b28) will increase coverage by 0.01%.
The diff coverage is 79.16%.

@@             Coverage Diff              @@
##                2.x    #1447      +/-   ##
============================================
+ Coverage     78.41%   78.42%   +0.01%     
  Complexity     2379     2379              
============================================
  Files           196      196              
  Lines          9591     9592       +1     
  Branches        955      955              
============================================
+ Hits           7521     7523       +2     
+ Misses         1636     1635       -1     
  Partials        434      434              

Flag	Coverage Δ
ml-commons	78.42% <79.16%> (+0.01%)	⬆️

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

Files	Coverage Δ
...n/model_group/TransportUpdateModelGroupAction.java	79.69% <79.16%> (+1.66%)	⬆️

... and 1 file with indirect coverage changes

[opensearch-trigger-bot]

The backport to main failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-main main
# Navigate to the new working tree
cd .worktrees/backport-main
# Create a new branch
git switch --create backport/backport-1447-to-main
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 1605d817b11bbc571655aea666bc68b02d0747fa
# Push it to GitHub
git push --set-upstream origin backport/backport-1447-to-main
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-main

Then, create a pull request where the base branch is main and the compare/head branch is backport/backport-1447-to-main.