Remove redundant force merge in rest tests

[finnegancarroll]

Description

Several aggregation rest tests assert on the number of optimized segments.
- match: { profile.shards.0.aggregations.0.debug.optimized_segments: 1 }

For these tests to be consistent our index can only have a single segment. As such we configure out test indices with 1 shard and no refresh interval to ensure a single segment.

settings:
  number_of_shards: 1
  number_of_replicas: 0
  refresh_interval: -1

We also force merge in these cases:

- do:
    indices.forcemerge:
      index: <index>
      max_num_segments: 1

These two operations are redundant so this pr removes the force merge step for these cases.

Related Issues

Inciting comment

Check List

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

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[github-actions]

✅ Gradle check result for 7fa1d93: SUCCESS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.01%. Comparing base (8ddb3ee) to head (7fa1d93).
Report is 4 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #16144      +/-   ##
============================================
+ Coverage     71.86%   72.01%   +0.15%     
- Complexity    64447    64492      +45     
============================================
  Files          5288     5288              
  Lines        301438   301439       +1     
  Branches      43552    43552              
============================================
+ Hits         216628   217087     +459     
+ Misses        67034    66489     -545     
- Partials      17776    17863      +87     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.