Add Kmeans and AD command documentation

[jackiehanyang]

Signed-off-by: jackieyanghan jkhanjob@gmail.com

Description

• Add Kmeans and AD command documentation
• Add doc-test for AD command. Not going to add doc-test for Kmeans command because the query result (ClusterID) serves as a symbol of different classifications, the map relationship is not fixed. Therefore, it's difficult to predict the query result in doc-test. Will add integration tests in the next PR to cover this.

Issues Resolved

#470

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented.
  • New functionality has javadoc added
  • New functionality has user manual doc 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-commenter]

Codecov Report

Merging #493 (5f4ce02) into main (fff24aa) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #493   +/-   ##
=========================================
  Coverage     95.25%   95.25%           
  Complexity     2746     2746           
=========================================
  Files           276      276           
  Lines          7416     7416           
  Branches        545      545           
=========================================
  Hits           7064     7064           
  Misses          298      298           
  Partials         54       54           

Flag	Coverage Δ
query-workbench	62.91% <ø> (ø)
sql-engine	98.40% <ø> (ø)

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

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update fff24aa...5f4ce02. Read the comment docs.

[penghuo]

replace checked-in ZIP with a dynamic dependency.
#491

[penghuo]

LGTM

[jackiehanyang]

Need to replace ml-commons zip file with a dynamic dependency, related open issues: issue 495, issue 491

[opensearch-trigger-bot]

The backport to 1.x 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-1.x 1.x
# Navigate to the new working tree
cd .worktrees/backport-1.x
# Create a new branch
git switch --create backport/backport-493-to-1.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 ee4bce03333b4f45379e6c5ae537011c6f4bf6f8
# Push it to GitHub
git push --set-upstream origin backport/backport-493-to-1.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-1.x

Then, create a pull request where the base branch is 1.x and the compare/head branch is backport/backport-493-to-1.x.