code: def configure(self, **kwargs):
          
          for k in list(self._conns):
              # try and preserve existing client to keep the persistent connections alive
              if k in self._kwargs and kwargs.get(k, None) == self._kwargs[k]:
                  continue
              del self._conns[k]
          self._kwargs = kwargs
docs: Configure multiple connections at once, useful for passing in config
          dictionaries obtained from other sources, like Django's settings or a
          configuration management tool.
  
          Example::
  
              connections.configure(
                  default={'hosts': 'localhost'},
                  dev={'hosts': ['esdev1.example.com:9200'], sniff_on_start=True}
              )
  
          Connections will only be constructed lazily when requested through
          ``get_connection``.