docs: def from_sniffing(self,
                        active_nodes,
                        sniff_on_start=True,
                        sniff_on_connection_fail=True,
                        sniffer_timeout=60, **kwargs):
          """
          Initialize a Elasticsearch client for specify to sniff on startup to
          inspect the cluster and load balance across all nodes.
          The client can be configured to inspect the cluster state to get
          a list of nodes upon startup, periodically and/or on failure.
  
          :param active_nodes: the list of active nodes
          :param sniff_on_start: flag indicating whether to obtain a list of nodes
              from the cluser at startup time
          :param sniff_on_connection_fail: flag controlling if connection failure triggers a sniff
          :param sniffer_timeout: number of seconds between automatic sniffs
          :return: void
          """
          self.client = Elasticsearch(active_nodes,
                                      sniff_on_start=sniff_on_start,
                                      sniff_on_connection_fail=sniff_on_connection_fail,
                                      sniffer_timeout=sniffer_timeout, **kwargs)
          logger.info('Initialize sniffing Elasticsearch Client: %s.' % self.client)