acf/pre_save_post

function my_pre_save_post( $post_id )
{
    global $wpdb;
    $entered_title  = $_POST['acf']['field_57dec9df66a5b'];
    $cleaned_title  = preg_replace('/[^A-Za-z0-9\-\s]/', '', $entered_title); // Removes special chars.
    $post_name      = sanitize_title($cleaned_title);

    // check if this is to be a new post
    if ( $post_id != 'new_post' )
    {
        // return $post_id;
    }

    $wpdb->update( $wpdb->posts, array( 'post_title' => $cleaned_title, 'post_name' => $post_name ), array( 'ID' => $post_id ) );
    update_field('field_57dec9df66a5b', $cleaned_title, $post_id);

    $to             = get_option('admin_email');
    $subject        = 'New submission';
    $message        = 'This is the message body';
    $headers[]      = 'From: Us <support@us.nl>';
    $headers[]      = 'Content-Type: text/html; charset=UTF-8';

    // return the same ID
    return $post_id;
}
add_filter('acf/pre_save_post' , 'my_pre_save_post', 10, 2 );