How can I copy data from one MongoDB collection to another using jenssegers

Solution:

Figured out. Assuming that I wanted to copy 2 attributes, ID and updated_at from sourcecollection to targetcollection

DB::collection('sourcecollection')->raw(function($collection) {
 return $collection->aggregate(array(
 array(
 '$project' => array(
  'ID' => 1,
  'updated_at' => 1
 )),
 array(   
  '$out' => 'targetcollection'
 ),
 )   
 );
}
 );