csvhtml5 exportoptions format body

Hello,

Looking to format one of my columns that I am exporting to a csv.

Cannot find a good example

I tried the following ... how do I format column 15 ... i tried just foobar but does not come through

Thanks,
Evan

    {extend: 'csvHtml5', text:'CSV', className:'btn-link',
     filename: 'my export ' ,
         exportOptions: {
     columns: [ ':visible' ],
     format: {
                 body: function ( data, row, column, node ) {
         return column == 15 ?
                         'foobar':
                         data;
                 }
     }
         }},

I am using
* https://datatables.net/download/#bs-3.3.7/jq-3.2.1/jszip-2.5.0/pdfmake-0.1.32/dt-1.10.16/e-1.6.5/af-2.2.2/b-1.4.2/b-colvis-1.4.2/b-flash-1.4.2/b-html5-1.4.2/b-print-1.4.2/cr-1.4.1/fc-3.2.3/fh-3.1.3/kt-2.3.2/r-2.2.0/rg-1.0.2/rr-1.2.3/sc-1.4.3/sl-1.2.3
*
* Included libraries:
* Bootstrap 3 3.3.7, jQuery 3 3.2.1, JSZip 2.5.0, pdfmake 0.1.32, DataTables 1.10.16, Editor 1.6.5, AutoFill 2.2.2, Buttons 1.4.2, Column visibility 1.4.2, Flash export 1.4.2, HTML5 export 1.4.2, Print view 1.4.2, ColReorder 1.4.1, FixedColumns 3.2.3, FixedHeader 3.1.3, KeyTable 2.3.2, Responsive 2.2.0, RowGroup 1.0.2, RowReorder 1.2.3, Scroller 1.4.3, Select 1.2.3