Fix the regression of terms agg optimization

[bowenlan-amzn]

Description

[Describe what this change achieves]

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 a9b0b3a: SUCCESS

[codecov]

Codecov Report

❌ Patch coverage is 72.72727% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.27%. Comparing base (3aed19d) to head (a9b0b3a).

Files with missing lines	Patch %	Lines
...ket/terms/GlobalOrdinalsStringTermsAggregator.java	33.33%	1 Missing and 1 partial ⚠️
.../org/opensearch/search/internal/SearchContext.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #20623      +/-   ##
============================================
- Coverage     73.30%   73.27%   -0.03%     
- Complexity    71965    72001      +36     
============================================
  Files          5781     5781              
  Lines        329200   329210      +10     
  Branches      47491    47492       +1     
============================================
- Hits         241314   241227      -87     
- Misses        68491    68658     +167     
+ Partials      19395    19325      -70     

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