code: def delete(self, bulk_id):
          
  
          collection_name = self.request.headers.get("collection")
  
          if not collection_name:
              self.raise_error(400, "Missing a collection name header")
  
          self.revisions = BaseAsyncMotorDocument("%s_revisions" % collection_name)
  
          self.logger.info("Deleting revisions with bulk_id %s" % (bulk_id))
  
          result = yield self.revisions.collection.remove({"meta.bulk_id": bulk_id})
  
          self.write(result)
docs: Update many objects with a single toa
  
          :param str bulk_id: The bulk id for the job you want to delete