docs: def _update_spec_config(self, document_name, spec):
          '''
          Dynamo implementation of project specific metadata spec
  
          '''
          # add the updated archive_metadata object to Dynamo
          self._spec_table.update_item(
              Key={'_id': '{}'.format(document_name)},
              UpdateExpression="SET config = :v",
              ExpressionAttributeValues={':v': spec},
              ReturnValues='ALL_NEW')