code: def es():
      return Elasticsearch()
  
imports: import pytest
  import os
  import hashlib
  from elasticsearch import Elasticsearch, ConnectionError, RequestError, NotFoundError
  from time import sleep
  from image_match.elasticsearch_driver import SignatureES
  from PIL import Image
label_desc: Use image node_id 4 for calling a global function with example usage: es() and returns: Elasticsearch