列で.notsortable()メソッドを直接使用できます 
 vm.dtOpt_product = DTOptionsBuilder.newOptions()
                .withOption('responsive', true)
        vm.dtOpt_product.withPaginationType('full_numbers');
        vm.dtOpt_product.withColumnFilter({
            aoColumns: [{
                    type: 'null'
                }, {
                    type: 'text',
                    bRegex: true,
                    bSmart: true
                }, {
                    type: 'text',
                    bRegex: true,
                    bSmart: true
                }, {
                    type: 'text',
                    bRegex: true,
                    bSmart: true
                }, {
                    type: 'select',
                    bRegex: false,
                    bSmart: true,
                    values: vm.dtProductTypes
                }]
        });
        vm.dtColDefs_product = [
            DTColumnDefBuilder.newColumnDef(0), DTColumnDefBuilder.newColumnDef(1),
            DTColumnDefBuilder.newColumnDef(2), DTColumnDefBuilder.newColumnDef(3).withClass('none'),
            DTColumnDefBuilder.newColumnDef(4), DTColumnDefBuilder.newColumnDef(5).notSortable()
        ];