text: /**
   * Responses must have the following format
   *
   * {
   *   resultados: string,
   *   terminos: string,
   *   items: integer,
   *   start: integer,
   *   documents: array,
   *     [{
   *       title: string,
   *       link: string,
   *       snippet: string,
   *       image: string
   *     }]
   * }
   *
   */
  
  module.exports = {
    bing: require('./bing'),
    ecosia: require('./ecosia'),
    google:  require('./google'),
    elasticsearch:  require('./elasticsearch'),
    searchcloud: require('./searchcloud')
  };