WP - Running No. Slug

functions.php

<?php
// Running No. Slug
add_action('wp_insert_post', 'change_slug');
function change_slug($post_id, $force = false)
{
    $post_types = ['news', 'faq'];
    $post_type  = $_POST['post_type'];

    if (!in_array($post_type, $post_types) || get_field('no', $post_id)) {
        return;
    }

    $i_no = new WP_Query([
        'post_type'  => $post_type,
        'posts_per_page' => 1,
        'meta_key' => 'no',
        'orderby' => 'meta_value_num',
        'order' => 'DESC',
    ]);

    while ($i_no->have_posts()) {
        $i_no->the_post();
        $max = get_field('no');
    }
    if (!$max) {
        $max = 0;
    }
    $new_no = (int)$max + 1;

    update_field('no', $new_no, $post_id);

    wp_update_post(array(
        'ID' => $post_id,
        'post_name' => $new_no
    ));
}