docs: def complete(self):
          """ Check, if out hashed date:url id is already in the index. """
          id = hashlib.sha1('%s:%s' % (self.date, self.url)).hexdigest()
          es = elasticsearch.Elasticsearch()
          try:
              es.get(index='frontpage', doc_type='html', id=id)
          except elasticsearch.NotFoundError:
              return False
          return True