Fix approximate pointrangequery tests

[harshavamsi]

Description

I noticed while backporting #13788 that some of the tests were flaky due to multiple segments being created and the correctness being harder to evaluate. Making small fixes to address the flakiness of the tests.

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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[github-actions]

✅ Gradle check result for 1fdf9a4: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 71.90%. Comparing base (738cdd3) to head (1fdf9a4).
Report is 45 commits behind head on main.

Files with missing lines	Patch %	Lines
...search/approximate/ApproximatePointRangeQuery.java	50.00%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               main   #15590    +/-   ##
==========================================
  Coverage     71.89%   71.90%            
- Complexity    63791    63882    +91     
==========================================
  Files          5249     5253     +4     
  Lines        298149   298405   +256     
  Branches      43084    43146    +62     
==========================================
+ Hits         214368   214568   +200     
- Misses        66126    66228   +102     
+ Partials      17655    17609    -46     

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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-15590-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 4f57d6aab21594a5ac20d26abbbba959aba1ab75
# Push it to GitHub
git push --set-upstream origin backport/backport-15590-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-15590-to-2.x.

[mch2]

@harshavamsi can you pls help backport this to 2.x

[andrross]

@harshavamsi It looks like the tests in question here were muted in #15601. Can you make sure those annotations get removed if this is properly fixed?

[harshavamsi]

@mch2 this is waiting on the original PR -- #15586 to be backported first, but gradle check is constantly null

[msfroh]

Original PR was backported to 2.x. Toggling the backport tag to retrigger auto-backport.