.DataTable({ processing: true, code example

Example: datatable processing

Spinner Example 
$(document).ready(function() {
   var table = $('#table_id').DataTable({
     "language": {
                    "processing": '<i class="fa fa-spinner fa-spin" style="font-size:24px;color:rgb(75, 183, 245);"></i>'
                 }
   });
 });