wordpress_search_ecwid.php

<?php
/*
 * Searchable Ecwid products add to functions.php
 */
// Pre post hook, query modifier
add_filter('pre_get_posts', 'tgm_io_cpt_search');
// Modifier function
function tgm_io_cpt_search($query) {
  if ($query->is_search) {
    // Add ec-product post type; will also except other custom post types
    $query->set('post_type', array('ec-product'));
  }
  // Return result
  return $query;
}

?>