code: func (a *ReverseNestedAggregation) Path(path string) *ReverseNestedAggregation {
  	a.path = path
  	return a
  }
docs: // Path set the path to use for this nested aggregation. The path must match
  // the path to a nested object in the mappings. If it is not specified
  // then this aggregation will go back to the root document.