[Backport] [2.x] [Concurrent Segment Search]: Add new query profile collector fields with concurrent search execution (#7898)

[ticheng-aws]

(cherry picked from commit c58dc1a)

Description

Backport of #7898 to 2.x branch.

To show high-level concurrent execution details, we bring min_slice_time_in_nanos, max_slice_time_in_nanos, and slice_count etc. fields into the query response. With these new fields, users can quickly determine query performance and skew issues.

Definition of existing collector fields

name: A more friendly representation of the collector's class name.
reason: A "hint" to help provide some context about this collector.
time_in_nanos: The total elapsed time for this collector. In the concurrent search case, this is the total time across all slices (i.e. max(slice_end_time) - min(slice_start_time))
children: A list of children collectors "embedded" inside this collector.

Definition of new collector fields with concurrent execution

reduce_time_in_nanos: The elapsed time in the reduce phase.
min_slice_time_in_nanos: The minimum slice time for this collector manager.
max_slice_time_in_nanos: The maximum slice time for this collector manager.
avg_slice_time_in_nanos: The average slice time for this collector manager.
slice_count: The segment slice count for this collector manager.

Related Issues

Resolves #7355
Doc update issue: opensearch-project/documentation-website#4281

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)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/17157/
• CommitID: 27ebba7
  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/17172/
• CommitID: 8e1e76f
  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.search.SearchWeightedRoutingIT.testStrictWeightedRoutingWithCustomString

• URL: https://build.ci.opensearch.org/job/gradle-check/17173/
• CommitID: f9a1dd6
  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 (Jenkins) Run Completed with:

• RESULT: ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/17174/
• CommitID: 52fd08e
  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.search.SearchWeightedRoutingIT.testStrictWeightedRoutingWithCustomString

• URL: https://build.ci.opensearch.org/job/gradle-check/17176/
• CommitID: fa83dc5
  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 #7975 (0f59e8b) into 2.x (3df1733) will increase coverage by 0.13%.
The diff coverage is 92.52%.

@@             Coverage Diff              @@
##                2.x    #7975      +/-   ##
============================================
+ Coverage     70.61%   70.75%   +0.13%     
- Complexity    56566    56649      +83     
============================================
  Files          4681     4681              
  Lines        268060   268158      +98     
  Branches      39656    39668      +12     
============================================
+ Hits         189301   189737     +436     
+ Misses        62438    62084     -354     
- Partials      16321    16337      +16     

Impacted Files	Coverage Δ
...ensearch/search/profile/query/CollectorResult.java	94.53% <87.71%> (-5.47%)	⬇️
...profile/query/InternalProfileCollectorManager.java	96.42% <97.61%> (+1.19%)	⬆️
...search/profile/query/InternalProfileCollector.java	85.18% <100.00%> (+0.56%)	⬆️
...nsearch/search/profile/query/ProfileCollector.java	100.00% <100.00%> (ø)

... and 468 files with indirect coverage changes

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/17183/
• CommitID: be44fd5
  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.indices.replication.SegmentReplicationIT.testScrollCreatedOnReplica

• URL: https://build.ci.opensearch.org/job/gradle-check/17187/
• CommitID: be44fd5
  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 (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/17193/
• CommitID: 0f59e8b