code: def add_text(self, docs, docs_matrix, **kwargs):
      if len(docs) == 2:
          docs[0].text = "merged"
  
imports: from docarray import Document, DocumentArray
  from jina import Executor, Flow, requests
  import pytest
label_desc: Use image node_id 1 for calling the MergeExecutor obj's underlying member method code with example usage: obj.add_text(docs, docs_matrix) without return types