facetwp change autocomplete button text

custom-hooks.php

<?php

/**
 * replace "Update" for search button with different text
 * change 'autocomplete_facet' to the name of your facet
 * Note that this text is also translation ready and could be 
 * modified using internationalization functions as well
 */
add_filter( 'facetwp_facet_html', function( $output, $params ) {
	if ( 'autocomplete_facet' == $params['facet']['name'] ) {
		$output = str_replace( 'Update', 'Search', $output );
	}
	return $output;
}, 10, 2 );