'Utility function to call the ``api/2.0/jobs/runs/submit`` endpoint.
:param json: The data used in the body of the request to the ``submit`` endpoint.
:type json: dict
:return: the run_id as a string
:rtype: string'

def submit_run(self, json):

    response = self._do_api_call(SUBMIT_RUN_ENDPOINT, json)
    return response['run_id']
