public ActionResult Index(SearchViewModel model)
        {
            if (!String.IsNullOrEmpty(model.q))
                model.Result = index.Search(model.q, model.f);

            return View(model);
        }
        public ActionResult Index(SearchViewModel model)
        {
            if (!String.IsNullOrEmpty(model.q))
                model.Results = indices.Select(index => index.Search(model.q));

            return View(model);
        }