code: def index(self, docs, **kwargs):
      for path_docs in docs.traverse(self._traversal_paths):
          for doc in path_docs:
              for i in range(5):
                  doc.matches.append(Document())
  
file_path: jina/tests/integration/high_order_matches/test_document.py
imports: from jina import Client, Document, Executor, Flow, requests
label_desc: Use image node_id 2 for calling the MatchAdder obj's underlying member method code with example usage: obj.index(docs) without return types