[Backport 2.x] Add SearchExtBuilders to SearchResponse

[austintlee]

Description

Backport #9379 to 2.x

Related Issues

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

Check List

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

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 025cee9

Incompatible components

Incompatible components: [https://github.com/opensearch-project/k-nn.git, https://github.com/opensearch-project/performance-analyzer.git]

Skipped components

Compatible components

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

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      1 org.opensearch.cluster.allocation.AwarenessAllocationIT.testThreeZoneOneReplicaWithForceZoneValueAndLoadAwareness

• URL: https://build.ci.opensearch.org/job/gradle-check/23766/
• CommitID: 025cee9
  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 #9625 (adb3e01) into 2.x (945c4b5) will increase coverage by 0.10%.
The diff coverage is 78.50%.

@@             Coverage Diff              @@
##                2.x    #9625      +/-   ##
============================================
+ Coverage     70.74%   70.84%   +0.10%     
- Complexity    57629    57757     +128     
============================================
  Files          4769     4770       +1     
  Lines        272600   272705     +105     
  Branches      40132    40147      +15     
============================================
+ Hits         192853   193206     +353     
+ Misses        63281    63021     -260     
- Partials      16466    16478      +12     

Files Changed	Coverage Δ
...a/org/opensearch/action/search/SearchResponse.java	88.42% <70.00%> (-1.21%)	⬇️
...org/opensearch/search/GenericSearchExtBuilder.java	73.84% <73.84%> (ø)
...ensearch/action/search/SearchResponseSections.java	97.43% <100.00%> (+1.13%)	⬆️
...search/search/internal/InternalSearchResponse.java	100.00% <100.00%> (ø)

... and 459 files with indirect coverage changes

[github-actions]

Compatibility status:

Checks if related components are compatible with change adb3e01

Incompatible components

Incompatible components: [https://github.com/opensearch-project/cross-cluster-replication.git, https://github.com/opensearch-project/performance-analyzer.git]

Skipped components

Compatible components

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

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/23815/
• CommitID: adb3e01
  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 (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/23817/
• CommitID: adb3e01
  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 (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/23823/
• CommitID: adb3e01
  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 (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/23827/
• CommitID: adb3e01
  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 (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      1 org.opensearch.action.admin.cluster.node.tasks.ResourceAwareTasksTests.testTaskResourceTrackingDuringTaskCancellation

• URL: https://build.ci.opensearch.org/job/gradle-check/23835/
• CommitID: adb3e01
  Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.