I might be wrong here, but after looking through the SimpleSearch class file (after some time trying to use the functionality), it doesn't appear that the fieldPotency option exists.
I did a quick search in the forums and found at least a couple of people wondering about this. I think it would be a service to the community if this deadend got axed from the documentation.
For now, I'm off to try AdvSearch...hope this helps.
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It's definitely in the code; in the sortResults() function at line 109 of core/components/simplesearch/model/simplesearch/driver/simplesearchdriver.class.php