code: private String evaluateFieldPath(MappedFieldMetaData fieldMetaData) {
          ResourcePaths.ResourcePath path = fieldMetaData.getPath();
          return (path.hasPlaceholders() ? path.resolve(this.placeholderVariableResolvers::resolve) : path).getPath();
      }
docs: Evaluates the {@link ResourcePaths.ResourcePath#hasPlaceholders() variables}
  in the {@link MappedFieldMetaData#getPath()} path} of the field, if any.