Add SortResponseProcessor to Search Pipelines

[dbwiddis]

Description

Adds a new SearchResponseProcessor implementation that sorts a field, comparable to the Ingest Pipeline Sort Processor.

Related Issues

Part 1 (of 2) of #14758

Documentation PR (for both this and #14800)

• Document new Split and Sort SearchResponseProcessors documentation-website#7767
  • JSON examples were the result of actual testing of this PR code
• Add API spec for Search Response Processors opensearch-api-specification#440

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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.

[github-actions]

❌ Gradle check result for 1ab7b67: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❕ Gradle check result for 7f398ea: UNSTABLE

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[codecov]

Codecov Report

Attention: Patch coverage is 82.25806% with 11 lines in your changes missing coverage. Please review.

Project coverage is 71.88%. Comparing base (45c5f8d) to head (5bc8c4d).
Report is 1 commits behind head on main.

Files	Patch %	Lines
.../search/pipeline/common/SortResponseProcessor.java	81.96%	5 Missing and 6 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #14785      +/-   ##
============================================
+ Coverage     71.73%   71.88%   +0.14%     
- Complexity    62393    62514     +121     
============================================
  Files          5147     5148       +1     
  Lines        293416   293477      +61     
  Branches      42426    42438      +12     
============================================
+ Hits         210472   210954     +482     
+ Misses        65562    65091     -471     
- Partials      17382    17432      +50     

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[dbwiddis]

Flaky test is tracked here:

• [AUTOCUT] Gradle Check Flaky Test Report for AzureBlobContainerRetriesTests #14318

[owaiskazi19]

Overall LG. Added few comments

[jackiehanyang]

LGTM, thanks for the change!

[github-actions]

❌ Gradle check result for 5199329: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❕ Gradle check result for 5bc8c4d: UNSTABLE

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[dbwiddis]

Flaky (unstable) test tracked by:

• [BUG] org.opensearch.search.SearchTimeoutIT.testSimpleTimeout fails intermittently  #9401

Merging!

[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/OpenSearch/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/OpenSearch/backport-2.x
# Create a new branch
git switch --create backport/backport-14785-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 5de0c8a7a3a63455758a8bfe24199f4955f29dca
# Push it to GitHub
git push --set-upstream origin backport/backport-14785-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/OpenSearch/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-14785-to-2.x.

[dbwiddis]

Should have waited to merge until backport of the Split processor was merged.... I will wait to manually backport until then.