Give bonus weight to WooCommerce total sales in SearchWP

functions.php

<?php

add_filter( 'searchwp_weight_mods', function( $sql ) {
	// Multiply total number of sales by 10 to add bonus weight.
	$multiplier = 10;

	return $sql .= " + IF(swpwcsalesboost.meta_value+0 > 0, (swpwcsalesboost.meta_value+0) * {$multiplier}, 0)";
} );

add_filter( 'searchwp_query_join', function( $sql, $engine ) {
	global $wpdb;

	return $sql . " LEFT JOIN {$wpdb->postmeta} AS swpwcsalesboost ON {$wpdb->posts}.ID = swpwcsalesboost.post_id AND swpwcsalesboost.meta_key = 'total_sales'";
}, 10, 2 );