[AUTO] [main] Add bwc version 2.18.1.

[opensearch-trigger-bot]

I've noticed that a new tag 2.18.0 was pushed, and added a bwc version 2.18.1.

[github-actions]

❌ Gradle check result for 3d5d4c6: 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 3d5d4c6: 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 00306e1: UNSTABLE

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

All modified and coverable lines are covered by tests ✅

Project coverage is 72.12%. Comparing base (0363aa7) to head (00306e1).
Report is 13 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #16573      +/-   ##
============================================
+ Coverage     72.00%   72.12%   +0.11%     
- Complexity    65038    65114      +76     
============================================
  Files          5313     5314       +1     
  Lines        303454   303542      +88     
  Branches      43910    43921      +11     
============================================
+ Hits         218510   218927     +417     
+ Misses        67040    66699     -341     
- Partials      17904    17916      +12     

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