'Downloads the contents of the stored file specified by file_id and
writes the contents to `destination`.
For example::
my_db = MongoClient().test
fs = GridFSBucket(my_db)
# Get _id of file to read
file_id = fs.upload_from_stream("test_file", "data I want to store!")
# Get file to write to
file = open(\'myfile\',\'wb+\')
fs.download_to_stream(file_id, file)
file.seek(0)
contents = file.read()
Raises :exc:`~gridfs.errors.NoFile` if no file with file_id exists.
:Parameters:
- `file_id`: The _id of the file to be downloaded.
- `destination`: a file-like object implementing :meth:`write`.'

def download_to_stream(self, file_id, destination):

    gout = self.open_download_stream(file_id)
    for chunk in gout:
        destination.write(chunk)
