`<https://www.elastic.co/guide/en/elasticsearch/reference/current/security-api-get-user.html>`_

        :arg username: A comma-separated list of usernames

def get_user(self, username=None, params=None):
        """
        `<https://www.elastic.co/guide/en/elasticsearch/reference/current/security-api-get-user.html>`_

        :arg username: A comma-separated list of usernames
        """
        return self.transport.perform_request(
            "GET", _make_path("_security", "user", username), params=params
        )