def METHOD_NAME(self) -> doxypy.Index:
    if self._index is None:
        self._index = doxypy.METHOD_NAME(self.path_resolver.doxygen_xml,
            name_transformer=transformers.NameTransformer(),
            transformer_passes= [
                transformers.PropertyTransformer(),
                transformers.RstDescriptionTransformer(),
            ]
        )
    return self._index