FacetWP – don’t index unpublished content from ACF relationship fields

<?php

function fwp_check_relationship_post_status( $params, $class ) {
    if ( 'YOUR_RELATIONSHIP_FIELD_NAME' == $params['facet_name'] ) {
        $post_id = (int) $params['facet_value'];
        if ( 'publish' != get_post_status( $post_id ) ) {
            return false; // skip indexing for this value
        }
    }
    return $params;
}
add_filter( 'facetwp_index_row', 'fwp_check_relationship_post_status', 10, 2 );