Support retrieving doc values of unsigned long field

[bugmakerrrrrr]

Description

Implement the LeafFieldData#getLeafValueFetcher method for unsigned long field to support retrieving doc values. Previously, attempting to use the docvalue_fields parameter to access doc values would result in a UOE being thrown.

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

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

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[bugmakerrrrrr]

@reta would you mind taking a look at this if you get a chance?

[github-actions]

✅ Gradle check result for f300e31: SUCCESS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.00%. Comparing base (0363aa7) to head (f300e31).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #16543      +/-   ##
============================================
- Coverage     72.00%   72.00%   -0.01%     
+ Complexity    65038    65030       -8     
============================================
  Files          5313     5313              
  Lines        303454   303460       +6     
  Branches      43910    43910              
============================================
- Hits         218510   218507       -3     
- Misses        67040    67067      +27     
+ Partials      17904    17886      -18     

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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-16543-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 a2a01f821760f7f27eaf6d30b6a4daaadda9fec8
# Push it to GitHub
git push --set-upstream origin backport/backport-16543-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-16543-to-2.x.

[reta]

ah @bugmakerrrrrr could you please backport to 2.x manually? thank you!

[dbwiddis]

Changelog conflict. I think it just needed #16536 merged first. Will try toggling the backport label to see if it regenerates properly.