specific column external search for ajax data source

vinaykumargattu

ajax data source code
$(document).ready(function() {
$('#example').DataTable( {
"ajax": "data/objects.txt",
"columns": [
{ "data": "name" },
{ "data": "position" },
{ "data": "office" },
{ "data": "extn" },
{ "data": "start_date" },
{ "data": "salary" }
]
} );
} );