feat(index): improve to support multiple fields with operator

[zbinlin]

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Description of change

Fixes #7007

[codecov]

Codecov Report

Merging #11934 into master will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #11934   +/-   ##
=======================================
  Coverage   96.23%   96.23%           
=======================================
  Files          95       95           
  Lines        9196     9200    +4     
=======================================
+ Hits         8850     8854    +4     
  Misses        346      346           

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[sushantdhiman]

LGTM, this should also fix #8553

Edit: It doesn't