code: def __get_metrics(self):
          
          esfilters_closed = None
          esfilters_opened = None
          if self.esfilters:
              esfilters_closed = self.esfilters.copy()
              esfilters_opened = self.esfilters.copy()
  
          closed = self.closed_class(self.es_url, self.es_index,
                                     start=self.start, end=self.end,
                                     esfilters=esfilters_closed, interval=self.interval)
          opened = self.opened_class(self.es_url, self.es_index,
                                     start=self.start, end=self.end,
                                     esfilters=esfilters_opened, interval=self.interval)
          return (closed, opened)
docs: Each metric must have its own filters copy to modify it freely