[Backport 2.x] Fix flaky test testStatsOnShardUnassigned in RemoteStoreStatsIT

[opensearch-trigger-bot]

Backport ff6a885 from #9057.

[opensearch-trigger-bot]

Compatibility status:

> Task :checkCompatibility
Incompatible components: [https://github.com/opensearch-project/geospatial.git, https://github.com/opensearch-project/index-management.git, https://github.com/opensearch-project/notifications.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/cross-cluster-replication.git, https://github.com/opensearch-project/ml-commons.git]
Components skipped due to git failures: [https://github.com/opensearch-project/opensearch-oci-object-storage.git]
Compatible components: [https://github.com/opensearch-project/security.git, https://github.com/opensearch-project/neural-search.git, https://github.com/opensearch-project/job-scheduler.git, https://github.com/opensearch-project/security-analytics.git, https://github.com/opensearch-project/sql.git, https://github.com/opensearch-project/observability.git, https://github.com/opensearch-project/asynchronous-search.git, https://github.com/opensearch-project/performance-analyzer.git, https://github.com/opensearch-project/common-utils.git, https://github.com/opensearch-project/performance-analyzer-rca.git, https://github.com/opensearch-project/reporting.git]

BUILD SUCCESSFUL in 26m 9s

[codecov]

Codecov Report

Merging #9090 (79a5a2d) into 2.x (aa59b15) will increase coverage by 0.00%.
Report is 3 commits behind head on 2.x.
The diff coverage is n/a.

@@            Coverage Diff            @@
##                2.x    #9090   +/-   ##
=========================================
  Coverage     70.86%   70.86%           
+ Complexity    57465    57431   -34     
=========================================
  Files          4750     4750           
  Lines        271535   271535           
  Branches      40056    40056           
=========================================
+ Hits         192428   192431    +3     
- Misses        62582    62593   +11     
+ Partials      16525    16511   -14     

see 459 files with indirect coverage changes

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/21795/
• CommitID: 79a5a2d
  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?

[Poojita-Raj]

Gradle Check (Jenkins) Run Completed with:

* **RESULT:** FAILURE ❌

* **URL:** https://build.ci.opensearch.org/job/gradle-check/21795/

* **CommitID:** [79a5a2d](https://github.com/opensearch-project/OpenSearch/commit/79a5a2d331b7a330f20b7da3cfc37d58c5c6bf7a)
  Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
  Is the failure [a flaky test](https://github.com/opensearch-project/OpenSearch/blob/main/DEVELOPER_GUIDE.md#flaky-tests) unrelated to your change?

org.opensearch.search.SearchWeightedRoutingIT.testStrictWeightedRoutingWithCustomString
Flaky: #8030

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/21810/
• CommitID: 79a5a2d