code: def index_name():
      return INDEX_NAME
  
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 1 for calling a global function with example usage: index_name() and returns: INDEX_NAME