use the correct type to widen the sort fields when merging top docs

[bugmakerrrrrr]

Description

See #16860

Related Issues

Resolves #16860

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 219f48d: 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 c011176: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 70.96774% with 9 lines in your changes missing coverage. Please review.

Project coverage is 72.15%. Comparing base (b5f651f) to head (c011176).

Files with missing lines	Patch %	Lines
...pensearch/action/search/SearchPhaseController.java	66.66%	5 Missing and 4 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #16881      +/-   ##
============================================
- Coverage     72.21%   72.15%   -0.06%     
+ Complexity    65335    65315      -20     
============================================
  Files          5318     5318              
  Lines        304081   304098      +17     
  Branches      43995    44003       +8     
============================================
- Hits         219578   219416     -162     
- Misses        66541    66677     +136     
- Partials      17962    18005      +43     

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