column.search() is not filtering my table

Can you please check what did I missed in my datatable. I've created a simple search but it's not filtering.

<input type="text" id="txtserial" name="txtSerial" class="form-control" />

Here's my javascript:

       var dtmyJob = $('#myJob').DataTable({
            "aLengthMenu": [[10, 25, 50, -1], [10, 25, 50, "All"]],
            iDisplayLength: -1,
            sScrollY: "40vh",
            bScrollInfinite: true, //this property disables pagination
            "scrollCollapse": true,
            "paging": false,
            "bInfo": false,
            "bFilter": false,
            "bSort": false
        });

        $("#txtserial").on('keyup', function () {
            dtmyJob.columns(2).search(this.value).draw();
            alert(dtmyJob);
        });