code: func (fs *UnstructAdapter) GetFieldValue(path string) (string, error) {
  	fields, err := parseFields(path)
  	if err != nil {
  		return "", err
  	}
  	s, found, err := unstructured.NestedString(
  		fs.UnstructuredContent(), fields...)
  	if found || err != nil {
  		return s, err
  	}
  	return "", fmt.Errorf("no field named '%s'", path)
  }
docs: // GetFieldValue returns value at the given fieldpath.