[Backport 2.x] Perform buildAggregation concurrently and partially support composite aggs

[jed326]

Backport 2.x for #12697

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

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[jed326]

@reta Here is the 2.x backport for #12697. Thanks!

[github-actions]

Compatibility status:

Checks if related components are compatible with change 36d14e4

Incompatible components

Skipped components

Compatible components

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

[github-actions]

❕ Gradle check result for 36d14e4: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.index.ShardIndexingPressureSettingsIT.testShardIndexingPressureEnforcedEnabledDisabledSetting
      1 org.opensearch.index.ShardIndexingPressureSettingsIT.classMethod
      1 org.opensearch.cluster.coordination.AwarenessAttributeDecommissionIT.testConcurrentDecommissionAction

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 63.82979% with 17 lines in your changes are missing coverage. Please review.

Project coverage is 71.09%. Comparing base (0dd892c) to head (36d14e4).
Report is 93 commits behind head on 2.x.

Files	Patch %	Lines
.../search/aggregations/BucketCollectorProcessor.java	76.47%	1 Missing and 3 partials ⚠️
...search/aggregations/GlobalAggCollectorManager.java	20.00%	3 Missing and 1 partial ⚠️
...rch/aggregations/NonGlobalAggCollectorManager.java	20.00%	3 Missing and 1 partial ⚠️
...ket/terms/GlobalOrdinalsStringTermsAggregator.java	83.33%	1 Missing and 1 partial ⚠️
...arch/aggregations/AggregationCollectorManager.java	50.00%	0 Missing and 1 partial ⚠️
.../bucket/composite/CompositeAggregationFactory.java	0.00%	1 Missing ⚠️
.../org/opensearch/search/internal/SearchContext.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #12940      +/-   ##
============================================
- Coverage     71.28%   71.09%   -0.20%     
- Complexity    60145    60364     +219     
============================================
  Files          4957     4985      +28     
  Lines        282799   284458    +1659     
  Branches      41409    41594     +185     
============================================
+ Hits         201591   202230     +639     
- Misses        64189    65165     +976     
- Partials      17019    17063      +44     

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