Add option to run field-specific pipelines in search

[dhdaines]

trafficstars

Fixes #152 ~but this will break bug-compatibility with lunr.js~ but make the fixed behaviour optional so as not to break bug-compatibility.

[yeraydiazdiaz]

Hi @dhdaines, I'm finally getting around to checking your PRs.

Seems this one is failing Black, could you rebase, run the formatter, and resubmit?

[dhdaines]

Thanks! I think I have a different version of Black installed in Emacs.

I'm going to take a second look at this one because as noted it breaks bug-compatibility. It would be nice to have the option to do this though.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.10%. Comparing base (d07b60f) to head (3c1a9ea).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #153      +/-   ##
==========================================
+ Coverage   96.02%   96.10%   +0.07%     
==========================================
  Files          48       48              
  Lines        3171     3209      +38     
==========================================
+ Hits         3045     3084      +39     
+ Misses        126      125       -1     

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