Remove FeatureFlag.MERGED_SEGMENT_WARMER_EXPERIMENTAL_FLAG

[kh3ra]

Description

Removing the experimental feature flag for merged segment warmer since its controlled by a dynamic cluster setting(added as part of PR) now. The feature is disabled by default.

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

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 bc0c2b4: FAILURE

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[ashking94]

lgtm

[ashking94]

@kh3ra can you please ensure that the java spotless checks are passing before you push these PRs?

[github-actions]

❌ Gradle check result for d8217bf: FAILURE

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[sandeshkr419]

Can you please also add a changelog?

[github-actions]

❌ Gradle check result for caeff59: FAILURE

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[github-actions]

❌ Gradle check result for 9286303: FAILURE

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[github-actions]

❌ Gradle check result for 7beb3e3: FAILURE

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[github-actions]

❌ Gradle check result for 6ddb75c: FAILURE

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[github-actions]

❌ Gradle check result for dac0824: FAILURE

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[github-actions]

❌ Gradle check result for 45110b8: FAILURE

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[kh3ra]

flaky: #17154

[github-actions]

✅ Gradle check result for ae996eb: SUCCESS

[codecov]

Codecov Report

❌ Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 73.12%. Comparing base (f6b6115) to head (ae996eb).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...va/org/opensearch/index/engine/InternalEngine.java	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #19715      +/-   ##
============================================
+ Coverage     73.10%   73.12%   +0.02%     
- Complexity    70919    70939      +20     
============================================
  Files          5737     5737              
  Lines        324767   324759       -8     
  Branches      46982    46980       -2     
============================================
+ Hits         237430   237492      +62     
+ Misses        68201    68164      -37     
+ Partials      19136    19103      -33     

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