I am trying to sort a collection by highest number in a field to lowest and save to another collection. I am using monk to connect to the DB.
This doesn't make sense. MongoDB doesn't store collections in an order according to any field. It just stores them in the order it writes them to disk (natural order), and this can change with later updates, deletes, and inserts. You want to create an index on the sort field and then use the index in queries to iterate through the documents in the correct order if you need to see them in a specific order.