Lower a category’s weight

I’m trying to severely lower a category’s weight so that any posts associated with that category will show at the end of the results.

// custom code for relevanssi I added
add_filter( 'relevanssi_match', 'rlv_boost_one_term' );
function rlv_boost_one_term( $match ) {
	if ( has_term( 'latest-news', 'category', $match->doc ) ) {
		$match->weight -= 10;
	}
	return $match;
}

Here’s the code I attempted using the documentation, but it doesn’t seem to change the search results at all, still all the same. My “weights” are still the default from install, so no changes, I figured removing 10 from this category would have those specific posts drop off, but it doesn’t.

Any help is appreciated.