fix register client API

[ylwu-amzn]

Description

Read more details : #1553

Issues Resolved

Resolve #1553

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 #1560 (c977acf) into main (0920ba7) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               main    #1560   +/-   ##
=========================================
  Coverage     78.40%   78.40%           
- Complexity     2378     2380    +2     
=========================================
  Files           195      195           
  Lines          9593     9595    +2     
  Branches        964      964           
=========================================
+ Hits           7521     7523    +2     
  Misses         1635     1635           
  Partials        437      437           

Flag	Coverage Δ
ml-commons	78.40% <100.00%> (+<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%)	⬆️

[opensearch-trigger-bot]

The backport to feature/agent_framework_dev 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-feature/agent_framework_dev feature/agent_framework_dev
# Navigate to the new working tree
cd .worktrees/backport-feature/agent_framework_dev
# Create a new branch
git switch --create backport/backport-1560-to-feature/agent_framework_dev
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 713dcba9f843b6fb1bb23dcb88973373371ea8df
# Push it to GitHub
git push --set-upstream origin backport/backport-1560-to-feature/agent_framework_dev
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-feature/agent_framework_dev

Then, create a pull request where the base branch is feature/agent_framework_dev and the compare/head branch is backport/backport-1560-to-feature/agent_framework_dev.