def drop_uniqueness_constraint(self, label, property_key):
        try:
            self._uniqueness_constraint_key_template.expand(
                label=label, property_key=property_key).delete()
        except GraphError as error:
            cause = error.__cause__
            if isinstance(cause, HTTPResponse):
                if cause.status_code == NOT_FOUND:
                    raise GraphError("No such unique constraint (label=%r, key=%r)" % (
                        label, property_key))
            raise
Remove the uniqueness constraint for a given property key.
dataset/ETHPy150Open nigelsmall/py2neo/py2neo/database/__init__.py/Schema.drop_uniqueness_constraint