$('#codigosAlumno').selectize({
        create: false,
        load: function(query, callback) {
            if (!query.length) return callback();
            console.log(query)
            $.ajax({
                url: '/Administrador/ConsultarAlumnosJSON?codigoFiltro=' + query,
                type: 'GET',
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                data: {
                    maxresults: 10
                },

                error: function () {
                    callback();
                },
                success: function (res) {
                    var rspns = eval(res);
                    console.log(rspns);
                    callback(rspns);
                }
            });
        }
    });