FacetWP - WP User Frontend save handler

functions.php

<?php

// Add the following to your (child) theme's functions.php

add_action( 'wpuf_add_post_after_insert', 'prefix_facetwp_index_post', 100 );
add_action( 'wpuf_edit_post_after_update', 'prefix_facetwp_index_post', 100 );

function prefix_facetwp_index_post( $post_id ) {
    if ( function_exists( 'FWP' ) ) {
        FWP()->indexer->index( $post_id );
    }
}