code: def get_source(self, index, doc_type, id, params=None):
      document = self.get(
          index=index, doc_type=doc_type, id=id, params=params
      )
      return document.get("_source")
  
imports: from __future__ import annotations
  import fnmatch
  import json
  from elasticsearch import Elasticsearch
  from elasticsearch.exceptions import NotFoundError
  from .utilities import MissingIndexException, get_random_id, query_params
label_desc: Use image node_id 9 for calling the FakeElasticsearch obj's underlying member method code with example usage: obj.get_source(index, doc_type, id, params) and returns: document