Rename search_only_replica settings to search_replica

[mch2]

Description

Rename search_only_replica settings to search_replica

Related Issues

Resolves ##17845

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[github-actions]

❌ Gradle check result for 747ac76: 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 0d22144: FAILURE

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[github-actions]

❌ Gradle check result for 0d22144: 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 d7b0f44: FAILURE

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[mch2]

❌ Gradle check result for d7b0f44: 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?

@sandeshkr419 Have seen this one pop up a couple of times as flaky - https://build.ci.opensearch.org/job/gradle-check/55966/testReport/junit/org.opensearch.search.aggregations.startree/RangeAggregatorTests/testRangeAggregation
https://build.ci.opensearch.org/job/gradle-check/55857/testReport/junit/org.opensearch.search.aggregations.startree/RangeAggregatorTests/testRangeAggregation/

/ Could you please take a look?

[github-actions]

❌ Gradle check result for d7b0f44: FAILURE

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[github-actions]

✅ Gradle check result for 85e4b00: SUCCESS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.38%. Comparing base (7b6108b) to head (85e4b00).
Report is 5 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #17857      +/-   ##
============================================
- Coverage     72.44%   72.38%   -0.07%     
+ Complexity    66483    66454      -29     
============================================
  Files          5409     5409              
  Lines        308282   308282              
  Branches      44759    44759              
============================================
- Hits         223344   223153     -191     
- Misses        66608    66813     +205     
+ Partials      18330    18316      -14     

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