Kendo MultiSelect Server Side Filtering

$(document).ready(function () {
           $("#products").kendoMultiSelect({
               placeholder: "Select products...",
               dataTextField: "ProductName",
               dataValueField: "ProductID",
               dataSource: {
                   type: "odata",
                   serverFiltering: true,
                   transport: {
                       read: {
                           url: "http://demos.kendoui.com/service/Northwind.svc/Products",
                           data: function () {                               
                               return {
                                   text: $("#products").data('kendoMultiSelect').input.val()
                               };
                           }
                       }
                   }
               }
           });
       });