Support searching from doc_value using termQueryCaseInsensitive/termQuery in flat_object/keyword field

[kkewwei]

Description

Support searching from doc_value using termQueryCaseInsensitive/termQuery in flat_object/keyword field, even if index=false

Related Issues

Resolves #16973

Check List

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

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[github-actions]

❌ Gradle check result for 73b3f77: 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 a6945d1: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 4 lines in your changes missing coverage. Please review.

Project coverage is 72.16%. Comparing base (e7e19f7) to head (a6945d1).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
...rg/opensearch/index/mapper/KeywordFieldMapper.java	80.00%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #16974      +/-   ##
============================================
- Coverage     72.20%   72.16%   -0.05%     
+ Complexity    65289    65254      -35     
============================================
  Files          5299     5299              
  Lines        303536   303550      +14     
  Branches      43941    43944       +3     
============================================
- Hits         219180   219062     -118     
- Misses        66441    66542     +101     
- Partials      17915    17946      +31     

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[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-16974-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 cc990c024fe5305f40daa6a1991cd3d9fa21467c
# Push it to GitHub
git push --set-upstream origin backport/backport-16974-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-16974-to-2.x.

[kkewwei]

I will backport manually.