: My index has a category field and I would like to apply a negative boost 
: to certain categories. For example, if I search for "thinkpad", it 
: should push results for the laptop bag and other accessory categories to 
: the bottom.

: So, I first tried altering the bq field with category:(batteries bags 
cables)^0.3.
        ...
: Is the only way to make this work to postively boost certain categories?

Bingo.  you need to boost all products *not* in those categories...

        bq = *:* -category:(batteries bags cables)


-Hoss

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