title: jQuery datatables columnDefs target a name rather than index
body: <p>In this code:</p>
  
  <pre><code>$('#example').dataTable( {
    "columnDefs": [ {
        "targets": 0,
        "searchable": false
      } ]
  } );
  </code></pre>
  
  <p>targets has been given a column index. But in my case, columns can be in varying orders. So my question is, can "targets" be given the name of the column parameter and if so, how?</p>