[Extensions ] Adds HttpPort setting to ExtensionInitializationRequest

[joshpalis]

Description

Companion SDK PR : opensearch-project/opensearch-sdk-java#788

Retrieves the http.host setting from Node.java and sends this value (present or default) to the extension during initialization for use in updating the extension settings, rest/java clients.

See related comment here

Related Issues

opensearch-project/opensearch-sdk-java#782

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)

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[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      1 org.opensearch.search.backpressure.SearchBackpressureIT.testSearchTaskCancellationWithHighCpu

• URL: https://build.ci.opensearch.org/job/gradle-check/16344/
• CommitID: 71c1c37
  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

Merging #7770 (71c1c37) into main (277eb3d) will increase coverage by 0.00%.
The diff coverage is 41.66%.

@@            Coverage Diff            @@
##               main    #7770   +/-   ##
=========================================
  Coverage     70.87%   70.87%           
- Complexity    56203    56211    +8     
=========================================
  Files          4682     4682           
  Lines        266099   266106    +7     
  Branches      39072    39075    +3     
=========================================
+ Hits         188595   188613   +18     
+ Misses        61520    61471   -49     
- Partials      15984    16022   +38     

Impacted Files	Coverage Δ
...a/org/opensearch/extensions/ExtensionsManager.java	56.80% <0.00%> (-0.27%)	⬇️
...ensearch/discovery/InitializeExtensionRequest.java	69.23% <50.00%> (-0.77%)	⬇️

... and 453 files with indirect coverage changes

[dbwiddis]

No objections to this as a temporary thing if you need it to unblock your work, however, the first thing the SDK's init request handler does after handling this request, is to request the environment settings.

Can you just delay whatever you're using this String for in the SDK until after you get the settings? Pretty sure for HTTP you don't need it immediately.

It's possible you might want "transport port" earlier, in which case you might want to proactively send the whole environment settings either here with this request, or in an immediate followup right after this init is acked.