[backport 2.x] Added static setting for checkPendingFlushUpdate functionality of lucene index writer

[CaptainDredge]

Description

This PR backports changes done in PR #12710

Related Issues

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

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Failing checks are inspected and point to the corresponding known issue(s) (See: Troubleshooting Failing Builds)
• Commits are signed per the DCO using --signoff
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)
• Public documentation issue/PR created

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 6a39e8a: 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]

Compatibility status:

Checks if related components are compatible with change e337787

Incompatible components

Skipped components

Compatible components

Compatible components: [https://github.com/opensearch-project/custom-codecs.git, https://github.com/opensearch-project/asynchronous-search.git, https://github.com/opensearch-project/performance-analyzer-rca.git, https://github.com/opensearch-project/cross-cluster-replication.git, https://github.com/opensearch-project/flow-framework.git, https://github.com/opensearch-project/job-scheduler.git, https://github.com/opensearch-project/security.git, https://github.com/opensearch-project/reporting.git, https://github.com/opensearch-project/geospatial.git, https://github.com/opensearch-project/neural-search.git, https://github.com/opensearch-project/common-utils.git, https://github.com/opensearch-project/k-nn.git, https://github.com/opensearch-project/security-analytics.git, https://github.com/opensearch-project/anomaly-detection.git, https://github.com/opensearch-project/notifications.git, https://github.com/opensearch-project/performance-analyzer.git, https://github.com/opensearch-project/observability.git, https://github.com/opensearch-project/ml-commons.git, https://github.com/opensearch-project/alerting.git, https://github.com/opensearch-project/index-management.git, https://github.com/opensearch-project/sql.git]

[github-actions]

✅ Gradle check result for e337787: SUCCESS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.26%. Comparing base (0dd892c) to head (e337787).
Report is 56 commits behind head on 2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #12786      +/-   ##
============================================
- Coverage     71.28%   71.26%   -0.02%     
- Complexity    60145    60310     +165     
============================================
  Files          4957     4972      +15     
  Lines        282799   283766     +967     
  Branches      41409    41497      +88     
============================================
+ Hits         201591   202224     +633     
- Misses        64189    64477     +288     
- Partials      17019    17065      +46     

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[opensearch-trigger-bot]

The backport to 2.13 failed:

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

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/backport-2.13 2.13
# Navigate to the new working tree
pushd ../.worktrees/backport-2.13
# Create a new branch
git switch --create backport/backport-12786-to-2.13
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 29bcc484974c9eb1cbec938dd379ffe3e1de695d
# Push it to GitHub
git push --set-upstream origin backport/backport-12786-to-2.13
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/backport-2.13

Then, create a pull request where the base branch is 2.13 and the compare/head branch is backport/backport-12786-to-2.13.