fix: adjust searchindex abstract sanitiziation

[jennifer-richards]

Fixes #10922

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.53%. Comparing base (432aa3b) to head (a8216bd).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10950      +/-   ##
==========================================
+ Coverage   88.51%   88.53%   +0.01%     
==========================================
  Files         332      332              
  Lines       44970    44941      -29     
==========================================
- Hits        39805    39787      -18     
+ Misses       5165     5154      -11     

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