Store the value/pk in the sorted set index

        For the parameters, see BaseRangeIndex.store

        We simple store the pk as a member of the sorted set with the value being the score

def store(self, key, pk, value):
        """Store the value/pk in the sorted set index

        For the parameters, see BaseRangeIndex.store

        We simple store the pk as a member of the sorted set with the value being the score
        """

        self.connection.zadd(key, value, pk)