docs: def flush(self, auth, resource, options=None, defer=False):
          """ Empties the specified resource of data per specified constraints.
  
          Args:
              auth: <cik>
              resource: resource to empty.
              options: Time limits.
          """
          args = [resource]
          if options is not None:
              args.append(options)
          return self._call('flush', auth, args, defer)