[AUTO] [main] Add bwc version 2.18.1.

[opensearch-trigger-bot[bot]]

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

[github-actions[bot]]

:x: Gradle check result for 3d5d4c69a2b53e825f66e5ae5f5fbd16c50e8ede: 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[bot]]

:x: Gradle check result for 3d5d4c69a2b53e825f66e5ae5f5fbd16c50e8ede: 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[bot]]

:grey_exclamation: Gradle check result for 00306e1e6ca373d99a08894a271c5acabff56fde: 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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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