FacetWP - index a Toolkit Types "select" field

functions.php

<?php

<?php

function fwp_index_serialized_field( $params, $class ) {
    if ( 'service_type' == $params['facet_name'] ) {
        $cf = (array) $params['facet_value']; // already unserialized
        foreach ( $cf as $row ) {
            foreach ( $row as $val ) {
                $params['facet_value'] = $val;
                $params['facet_display_value'] = $val;
                $class->insert( $params );
            }
        }
        return false;
    }
    return $params;
}
add_filter( 'facetwp_index_row', 'fwp_index_serialized_field', 10, 2 );