[Backport 2.x] Throw UnsupportedOperationException in unused methods

[opensearch-trigger-bot[bot]]

Backport 20ebe6e0c03eaa167a082a3e0522fdb0a8d54d0b from #15446.

[github-actions[bot]]

:x: Gradle check result for 3cd2bddbab855a633a202206ed44c42ece8637ff: 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 3cd2bddbab855a633a202206ed44c42ece8637ff: 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 3cd2bddbab855a633a202206ed44c42ece8637ff: 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]]

:white_check_mark: Gradle check result for 3cd2bddbab855a633a202206ed44c42ece8637ff: SUCCESS

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 71.64%. Comparing base (e80c06e) to head (3cd2bdd). Report is 7 commits behind head on 2.x.

Files with missing lines	Patch %	Lines
...rg/opensearch/index/engine/TranslogLeafReader.java	0.00%	2 Missing :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #15449      +/-   ##
============================================
- Coverage     71.64%   71.64%   -0.01%     
- Complexity    63462    63477      +15     
============================================
  Files          5213     5213              
  Lines        297357   297357              
  Branches      43283    43283              
============================================
- Hits         213042   213035       -7     
- Misses        66497    66498       +1     
- Partials      17818    17824       +6     

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