Cfindex fieldboost does nothing - CF10

Using cfindex to attempt to boost the "Question" field over the "Answer" field of Q&A data. I see no effect from adding anything in the fieldboost field on the index.

<cfindex action="refresh" collection="faq" type="custom" title="question" body="question,answer" fieldboost="question:2" key="faq_id" query="updateQuery" location_i="location_id" />

I get the exact same results if fieldboost is there or not. No change.