Each metric must have its own filters copy to modify it freely

def __get_metrics(self):
        """ Each metric must have its own filters copy to modify it freely"""
        esfilters_close = None
        esfilters_submit = None
        if self.esfilters:
            esfilters_close = self.esfilters.copy()
            esfilters_submit = self.esfilters.copy()

        closed = ClosedPR(self.es_url, self.es_index,
                          start=self.start, end=self.end,
                          esfilters=esfilters_close, interval=self.interval)
        # For BMI we need when the ticket was closed
        closed.FIELD_DATE = 'closed_at'
        submitted = SubmittedPR(self.es_url, self.es_index,
                                start=self.start, end=self.end,
                                esfilters=esfilters_submit,
                                interval=self.interval)

        return (closed, submitted)