Making a column unsortable?

jstemper

How do I make a specific column unsortable? I have a grid with a link in the final column and I want to prevent sorting on that column.
My current startup call:

 $('#rollupTable').DataTable({
                "scrollX": true,
                "colReorder": true,               
                fixedColumns: {
                    leftColumns: 1
                    //rightColumns:1
                }
            });

tangerine

https://datatables.net/reference/option/columns.orderable