Abstracting outbound side of transport

[VachaShah]

Description

Coming from #13178 (comment) and as a next step to #12967, abstracting and adding support for multiple protocols on outbound side of transport.

Related Issues

Resolves #[Issue number to be closed when this PR is merged]
Part of #10684

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 0a9c4d8: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.http.SearchRestCancellationIT.testAutomaticCancellationDuringQueryPhase

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[codecov]

Codecov Report

Attention: Patch coverage is 95.31250% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 71.52%. Comparing base (b15cb0c) to head (cc43b4b).
Report is 273 commits behind head on main.

Files	Patch %	Lines
...ransport/nativeprotocol/NativeOutboundHandler.java	95.65%	1 Missing and 1 partial ⚠️
...ransport/nativeprotocol/NativeOutboundMessage.java	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #13293      +/-   ##
============================================
+ Coverage     71.42%   71.52%   +0.10%     
- Complexity    59978    61039    +1061     
============================================
  Files          4985     5054      +69     
  Lines        282275   287150    +4875     
  Branches      40946    41607     +661     
============================================
+ Hits         201603   205373    +3770     
- Misses        63999    64813     +814     
- Partials      16673    16964     +291     

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[VachaShah]

@reta @dblock Let me know what you guys think.

[github-actions]

❌ Gradle check result for 9e629ae: 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 0ab2aec: 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 c904eda: 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 0a7c0a3: 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 5048253: SUCCESS

[reta]

@VachaShah pefrect, thank you! @dblock mind taking a look please, thank you?

[github-actions]

✅ Gradle check result for cc43b4b: SUCCESS

[dblock]

Looks great, let's merge it.

[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-13293-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 14f1c43c108f378b13d109ade364216c082fb858
# Push it to GitHub
git push --set-upstream origin backport/backport-13293-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-13293-to-2.x.

[dblock]

@VachaShah manual backport pls :(

[VachaShah]

@VachaShah manual backport pls :(

Thank you @dblock! Added the backport in #13656.