Disabled auto_expand_replicas setting when search replica is enabled

[vinaykpud]

Description

In this PR we are disabling the auto_expand_replicas when the search replica is active. So this adds the mutual exclusiveness between the index.auto_expand_replicas and index.number_of_search_only_replicas settings.

Related Issues

Resolves #16912
Related to #15306

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 c6a1d64: FAILURE

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❌ Gradle check result for c6a1d64: FAILURE

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❌ Gradle check result for b985309: FAILURE

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❌ Gradle check result for 03ea0e9: FAILURE

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❕ Gradle check result for 03ea0e9: UNSTABLE

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.15%. Comparing base (ab546ae) to head (5ae03df).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #16916      +/-   ##
============================================
- Coverage     72.23%   72.15%   -0.09%     
+ Complexity    65210    65184      -26     
============================================
  Files          5299     5299              
  Lines        303475   303499      +24     
  Branches      43925    43933       +8     
============================================
- Hits         219217   218976     -241     
- Misses        66254    66527     +273     
+ Partials      18004    17996       -8     

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[github-actions]

✅ Gradle check result for 5ae03df: SUCCESS