code: def _retry(function):
          
  
          def inner(self, **kwargs):
              last_exception = None
              #for host in self.router.get_hosts(**kwargs):
              for host in self.host:
                  try:
                      return function(self, host, **kwargs)
                  except SolrError as e:
                      self.logger.exception(e)
                      raise
                  except ConnectionError as e:
                      self.logger.exception("Tried connecting to Solr, but couldn't because of the following exception.")
                      if '401' in e.__str__():
                          raise
                      last_exception = e
              # raise the last exception after contacting all hosts instead of returning None
              if last_exception is not None:
                  raise last_exception
          return inner
docs: Internal mechanism to try to send data to multiple Solr Hosts if
          the query fails on the first one.