feat: remove search index tool

[yuye-aws]

Description

Remove search index tool in the current repo: #294

Issues Resolved

Remove search index tool in the current repo: #294

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

All modified and coverable lines are covered by tests ✅

Project coverage is 82.33%. Comparing base (02a3209) to head (291de19).
Report is 2 commits behind head on main.

❗ Current head 291de19 differs from pull request most recent head 148df73. Consider uploading reports for the commit 148df73 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #295      +/-   ##
============================================
+ Coverage     81.62%   82.33%   +0.71%     
+ Complexity      216      200      -16     
============================================
  Files            13       12       -1     
  Lines          1083     1019      -64     
  Branches        149      142       -7     
============================================
- Hits            884      839      -45     
+ Misses          140      125      -15     
+ Partials         59       55       -4     

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[yuye-aws]

@ylwu-amzn Please help attach backport 2.x label.

[yuye-aws]

@yuye-aws This PR is ready for review now.

[ylwu-amzn]

@yuye-aws CI failed, fix it?

[yuye-aws]

@yuye-aws CI failed, fix it?

Adding a new commit to fix the CI error. You can review now.

[yuye-aws]

Please merge this PR after this one: opensearch-project/ml-commons#2356

[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Navigate to the root of your repository
cd $(git rev-parse --show-toplevel)
# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/skills/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/skills/backport-2.x
# Create a new branch
git switch --create backport/backport-295-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 0e65e621137b0fbb7629ffd222dce1b300b241b4
# Push it to GitHub
git push --set-upstream origin backport/backport-295-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/skills/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-295-to-2.x.