bugfix: re-add support for not text_match

[itschrispeck]

#11185 incidentally caused a regression with inverse text_match - due to setting _numDocs as 0 in BaseFilterOperator, .getFalses() always returns an empty set. This PR reverts the behavior and allows for not text_match to work again.

tag: bugfix

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5c81c0a) 61.56% compared to head (5e8c1c4) 61.69%.
Report is 14 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #12372      +/-   ##
============================================
+ Coverage     61.56%   61.69%   +0.12%     
- Complexity      201      207       +6     
============================================
  Files          2426     2426              
  Lines        132709   132709              
  Branches      20519    20519              
============================================
+ Hits          81706    81874     +168     
+ Misses        44994    44828     -166     
+ Partials       6009     6007       -2     

Flag	Coverage Δ
custom-integration1	<0.01% <0.00%> (?)
integration	<0.01% <0.00%> (+<0.01%)	⬆️
integration1	<0.01% <0.00%> (?)
integration2	0.00% <0.00%> (ø)
java-11	61.64% <100.00%> (+61.64%)	⬆️
java-21	61.56% <100.00%> (-0.01%)	⬇️
skip-bytebuffers-false	61.66% <100.00%> (+0.11%)	⬆️
skip-bytebuffers-true	61.54% <100.00%> (+26.71%)	⬆️
temurin	61.69% <100.00%> (+0.12%)	⬆️
unittests	61.68% <100.00%> (+0.12%)	⬆️
unittests1	46.89% <100.00%> (+0.16%)	⬆️
unittests2	27.69% <0.00%> (+<0.01%)	⬆️

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