facetwp index "any" for woocommerce variations

custom-hooks.php

<?php

/** handles indexing when a woocommerce variation has "any" selected instead of specific values **/
add_filter( 'facetwp_indexer_row_data', function( $rows, $args ) {

    if ( 0 === strpos( $args['defaults']['facet_source'], 'cf/attribute_pa_' ) ) {
        foreach ( $rows AS $row ) {
            if ( 'product_variation' == get_post_type( $row['post_id'] ) && '' == $row['facet_value'] ) {
                $parent = wp_get_post_parent_id( $row['post_id'] );
                if ( 0 === strpos( $row['facet_source'], 'cf/attribute_pa_' ) ) {
                    $taxonomy = str_replace( 'cf/attribute_', '', $row['facet_source'] );
                    $terms = get_the_terms( $parent, $taxonomy );
                    if ( !is_wp_error( $terms ) && !empty( $terms ) ) {
                        foreach ( $terms AS $term ) {
                            $params = $row;
                            $params['term_id'] = $term->term_id;
                            $params['facet_display_value'] = $term->name;
                            $params['facet_value'] = $term->slug;
                            $params['variation_id'] = $row['post_id'];
                            $params['post_id'] = $parent;
                            $rows[] = $params;
                        }
                    }
                }
            }
        }
    }

    return $rows;

}, 11,2 );