def DoDiff(self, definitions):
    StatusUpdate('Fetching index definitions diff.')
    response = self.server.Send('/api/datastore/index/diff',
                                app_id=self.config.application,
                                payload=definitions.ToYAML())
    return datastore_index.ParseMultipleIndexDefinitions(response)
Retrieve diff file from the server.
dataset/ETHPy150Open CollabQ/CollabQ/.google_appengine/google/appengine/tools/appcfg.py/IndexOperation.DoDiff