To add entity meta data to a datastream
        :param datastream: string
        :param options: dict

def get_entity_meta(self, datastream):
        """
        To add entity meta data to a datastream
        :param datastream: string
        :param options: dict
        """
        url = '/datastream/' + str(datastream) + '/entityMeta'
        response = self.http.get(url)
        entityMetaList = []
        for entityMeta in response:
            entityMetaList.append(Schemas.EntityMeta(entityMeta=entityMeta))
        return entityMetaList