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/*
Plugin Name: Bulk Update Post
Description: Quick plugin to update posts with whatever you want
Author: James Wills
*/
add_action('init','update_stuff');

function update_stuff(){

    $my_posts = get_posts( array('post_type' => 'product' ) );

    foreach ( $my_posts as $my_post ):

        if($my_post->post_title === 'test-en') {
            $my_post->post_title = 'test-en-updated';
        }

        wp_update_post( $my_post );

    endforeach;
}