[Streaming Indexing] Enhance RestClient with a new streaming API support

[reta]

Description

Enhance RestClient with a new streaming API support

Related Issues

Resolves #9072

Check List

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

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 a6ec079: 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 5b112c6: 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 4afb721: 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 4afb721: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 28.08511% with 169 lines in your changes missing coverage. Please review.

Project coverage is 71.83%. Comparing base (eb306d2) to head (ae79354).
Report is 2 commits behind head on main.

Files	Patch %	Lines
...rc/main/java/org/opensearch/client/RestClient.java	23.00%	87 Missing ⚠️
.../rest/action/document/RestBulkStreamingAction.java	0.00%	23 Missing ⚠️
.../java/org/opensearch/client/StreamingResponse.java	0.00%	17 Missing ⚠️
...ch/client/http/ReactiveHttpUriRequestProducer.java	0.00%	16 Missing ⚠️
...n/java/org/opensearch/client/StreamingRequest.java	43.47%	12 Missing and 1 partial ⚠️
...c/main/java/org/opensearch/client/Cancellable.java	0.00%	7 Missing ⚠️
...r/netty4/ReactorNetty4NonStreamingHttpChannel.java	57.14%	3 Missing ⚠️
...g/opensearch/client/ResponseWarningsExtractor.java	94.73%	0 Missing and 1 partial ⚠️
...ctor/netty4/ReactorNetty4StreamingHttpChannel.java	50.00%	1 Missing ⚠️
.../main/java/org/opensearch/rest/RestController.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #14437      +/-   ##
============================================
+ Coverage     71.77%   71.83%   +0.05%     
- Complexity    62689    62811     +122     
============================================
  Files          5163     5167       +4     
  Lines        294412   294610     +198     
  Branches      42582    42602      +20     
============================================
+ Hits         211325   211621     +296     
+ Misses        65689    65581     -108     
- Partials      17398    17408      +10     

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[github-actions]

✅ Gradle check result for 5727a15: SUCCESS

[github-actions]

✅ Gradle check result for 2013db6: SUCCESS

[github-actions]

❕ Gradle check result for 6150ca1: UNSTABLE

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

[github-actions]

❌ Gradle check result for 07b0ec0: 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 caadea4: 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 d261cd6: UNSTABLE

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

[reta]

@reta Sorry for the delay on the review and now we've got a conflict :(

Thanks a lot @andrross , resolved!

[github-actions]

✅ Gradle check result for 0fc506a: SUCCESS

[github-actions]

✅ Gradle check result for ae79354: SUCCESS

[reta]

@andrross if you don't mind please, one more time to approve (conflicts again!), thank you!

[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-14437-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 79f45be4a544dd3519521294b63bd1630c3dfd54
# Push it to GitHub
git push --set-upstream origin backport/backport-14437-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-14437-to-2.x.