You can copy the latest version of a document to a new document by specifying the current document and target document:
COPY http://couchdb:5984/recipes/FishStew Content-Type: application/json Destination: IrishFishStew
        The above request copies the document
        FishStew to the new document
        IrishFishStew. The response is the ID and
        revision of the new document.
      
{
   "id" : "IrishFishStew",
   "rev" : "1-9c65296036141e575d32ba9c034dd3ee"
}