def get_biothing(self, bid, only_source=False, **kwargs):
        rawdoc = self._es.get(index=self._index, id=bid, doc_type=self._doc_type, **kwargs)
        if not only_source:
            return rawdoc
        else:
            doc = rawdoc['_source']
            doc["_id"] = rawdoc["_id"]
            return doc