Add the means to extract the contextual underlying channel from HttpChannel without excessive typecasting

[reta]

Description

Follow up on #10562 since more type casting code has been added into the security plugin.

Related Issues

Relates to opensearch-project/security#3911

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]

Compatibility status:

Checks if related components are compatible with change 1a6940b

Incompatible components

Skipped components

Compatible components

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

[github-actions]

❌ Gradle check result for dd95708: 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 1a6940b: SUCCESS

[codecov]

Codecov Report

Attention: 167 lines in your changes are missing coverage. Please review.

Comparison is base (36bd674) 71.27% compared to head (1a6940b) 71.36%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
...org/opensearch/index/mapper/NumberFieldMapper.java	40.26%	68 Missing and 21 partials ⚠️
.../document/SortedUnsignedLongDocValuesSetQuery.java	15.09%	43 Missing and 2 partials ⚠️
.../main/java/org/apache/lucene/util/LongHashSet.java	39.62%	21 Missing and 11 partials ⚠️
.../org/opensearch/http/netty4/Netty4HttpChannel.java	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #11751      +/-   ##
============================================
+ Coverage     71.27%   71.36%   +0.09%     
- Complexity    59176    59273      +97     
============================================
  Files          4909     4911       +2     
  Lines        278429   278656     +227     
  Branches      40460    40525      +65     
============================================
+ Hits         198443   198869     +426     
+ Misses        63528    63268     -260     
- Partials      16458    16519      +61     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[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-11751-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 808ed56bcbc6ed547f64895cd02283df07fb5c48
# Push it to GitHub
git push --set-upstream origin backport/backport-11751-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-11751-to-2.x.