Wordpress - Search private posts

twentyseventeen-child_-_functions.php

<?php

// SEARCH PRIVATE POSTS
// https://wordpress.stackexchange.com/questions/110569/private-posts-pages-search
add_action('pre_get_posts','filter_search');

function filter_Search($query){
    if( is_admin() || ! $query->is_main_query() ) return;
    if ($query->is_search) {
        if( current_user_can('edit_private_posts') ) {
            $query->set('post_status',array('private','publish'));
        }
    }
}