fix: set searchindex hiddenDefault flag

[jennifer-richards]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.51%. Comparing base (e2604a5) to head (3189215).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10916      +/-   ##
==========================================
- Coverage   88.51%   88.51%   -0.01%     
==========================================
  Files         332      332              
  Lines       44970    44973       +3     
==========================================
+ Hits        39807    39809       +2     
- Misses       5163     5164       +1     

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