Fast search error：unexpected token

fast search的 query中若有空白字元, 直接塞進 QueryString就會出現 [error：unexpected token]的訊息

解決方式：
在 serchview.Search(...)之前, 先把 query做 and變更的處理
ex: QueryString="web android" → QueryString="and(web,android)"

// process when query contains space char

if (_customizeQuery.Contains(" ")) 
{
    string[] splitString = _customizeQuery.Split(' ');
    _query.QueryString 
       = string.Format("and({0})", string.Join(",", splitString));
}
_searchView = _searchFactory.GetSearchView(config.collection);
_searchResult = _searchView.Search(_query);