[Backport] [2.x] Ensure support of the transport-nio by security plugin (HTTP) (#16474)

[reta]

Backport of https://github.com/opensearch-project/OpenSearch/pull/16474 to 2.x

[github-actions[bot]]

:x: Gradle check result for dad027fcd09ae9aac2742556872ad137f38cab59: 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?

[reta]

@andrross if you don't mind this backport please, thank you!

[github-actions[bot]]

:white_check_mark: Gradle check result for dad027fcd09ae9aac2742556872ad137f38cab59: SUCCESS

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 68.91892% with 23 lines in your changes missing coverage. Please review.

Project coverage is 71.76%. Comparing base (2fa8370) to head (dad027f). Report is 3 commits behind head on 2.x.

Files with missing lines	Patch %	Lines
...ain/java/org/opensearch/http/nio/ssl/SslUtils.java	0.00%	13 Missing :warning:
...rg/opensearch/http/nio/NioHttpServerTransport.java	87.17%	3 Missing and 2 partials :warning:
...g/opensearch/transport/nio/NioTransportPlugin.java	0.00%	3 Missing :warning:
.../org/opensearch/http/nio/HttpReadWriteHandler.java	77.77%	1 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 2.x #16565 +/- ## ============================================ - Coverage 71.95% 71.76% -0.20% + Complexity 65440 65387 -53 ============================================ Files 5312 5313 +1 Lines 305033 305098 +65 Branches 44443 44452 +9 ============================================ - Hits 219475 218939 -536 - Misses 67269 67912 +643 + Partials 18289 18247 -42 ```

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