function(dateBeg, dateEnd) {
var db1 = connect('IP:27017/databaseName');
    db1.auth("login","password");     

var   result = 
   db.transactions.aggregate([...],{allowDiskUse:true},
   {noTimeout: true}
   );
  
    while (result.hasNext()) 
  {
    p =  result.next();
    db1.MAS_aggregated_data.insert(p);      
  };
    result.close();
}