[Backport 2.x] update index random function to fix the bogus document deletion

[opensearch-trigger-bot]

Backport 2bd709b from #11142.

[github-actions]

Compatibility status:

Checks if related components are compatible with change 773fb83

Incompatible components

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

Skipped components

Compatible components

Compatible components: [https://github.com/opensearch-project/security-analytics.git, https://github.com/opensearch-project/asynchronous-search.git, https://github.com/opensearch-project/observability.git, https://github.com/opensearch-project/notifications.git, https://github.com/opensearch-project/reporting.git, https://github.com/opensearch-project/custom-codecs.git, https://github.com/opensearch-project/job-scheduler.git, https://github.com/opensearch-project/common-utils.git, https://github.com/opensearch-project/neural-search.git, https://github.com/opensearch-project/anomaly-detection.git, https://github.com/opensearch-project/geospatial.git, https://github.com/opensearch-project/ml-commons.git, https://github.com/opensearch-project/index-management.git, https://github.com/opensearch-project/alerting.git, https://github.com/opensearch-project/security.git, https://github.com/opensearch-project/sql.git, https://github.com/opensearch-project/cross-cluster-replication.git, https://github.com/opensearch-project/k-nn.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/29822/
• CommitID: 773fb83
  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: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/29888/
• CommitID: 773fb83

[codecov]

Codecov Report

Merging #11161 (773fb83) into 2.x (827099e) will increase coverage by 0.05%.
Report is 1 commits behind head on 2.x.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x   #11161      +/-   ##
============================================
+ Coverage     70.88%   70.93%   +0.05%     
- Complexity    58926    58967      +41     
============================================
  Files          4862     4862              
  Lines        278389   278389              
  Branches      40806    40806              
============================================
+ Hits         197336   197482     +146     
+ Misses        64289    64137     -152     
- Partials      16764    16770       +6     

see 460 files with indirect coverage changes