[SnapshotV2] Add snapshot size to status response for shallow V2 snapshots

[ltaragi]

Description

• The primaryStoreSize is calculated at the time of consolidation of shard level info in InternalClusterInfoService.java
• This primaryStoreSize is further included in ClusterInfo. It also implements getPrimaryStoreSize, which can be called during the snapshot creation to persist this piece of information as the snapshot's size in bytes inside SnapshotInfo
• This size in bytes value is read from SnapshotInfo and returned for shallow V2 snapshots
• Use assertBusy to prevent flakiness in org.opensearch.snapshots.SnapshotStatusApisIT.testStatusAPICallForShallowCopySnapshot

Related Issues

Resolves this comment of #15463

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[github-actions]

❌ Gradle check result for b2bda82: 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?

[github-actions]

❌ Gradle check result for 39248a5: 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?

[github-actions]

❕ Gradle check result for 002abda: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.smoketest.SmokeTestMultiNodeClientYamlTestSuiteIT.test {yaml=search.aggregation/360_date_histogram/Date histogram aggregation w/ shared field range test}

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 50.98039% with 25 lines in your changes missing coverage. Please review.

Project coverage is 71.90%. Comparing base (41ba00a) to head (002abda).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
...in/java/org/opensearch/snapshots/SnapshotInfo.java	47.36%	7 Missing and 3 partials ⚠️
...admin/cluster/snapshots/status/SnapshotStatus.java	41.66%	6 Missing and 1 partial ⚠️
.../main/java/org/opensearch/cluster/ClusterInfo.java	55.55%	2 Missing and 2 partials ⚠️
...apshots/status/TransportSnapshotsStatusAction.java	0.00%	3 Missing ⚠️
...ava/org/opensearch/snapshots/SnapshotsService.java	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #15573      +/-   ##
============================================
- Coverage     71.91%   71.90%   -0.01%     
+ Complexity    63864    63817      -47     
============================================
  Files          5251     5252       +1     
  Lines        298375   298491     +116     
  Branches      43146    43174      +28     
============================================
+ Hits         214572   214639      +67     
- Misses        66158    66162       +4     
- Partials      17645    17690      +45     

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[ltaragi]

❕ Gradle check result for 002abda: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.smoketest.SmokeTestMultiNodeClientYamlTestSuiteIT.test {yaml=search.aggregation/360_date_histogram/Date histogram aggregation w/ shared field range test}

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

Flaky test #14408

[devvratsaini]

While checking this in 'main', please could you help add a TODO comment with the specific version this needs to be replaced with in the follow-up PR? Applicable for all places we have added 'Version.CURRENT'