docs: def existing_analysis(using):
      """
      Get the existing analysis for the `using` Elasticsearch connection
      """
      es = connections.get_connection(using)
      index_name = settings.ELASTICSEARCH_CONNECTIONS[using]['index_name']
      if es.indices.exists(index=index_name):
          return stringer(es.indices.get_settings(index=index_name)[index_name]['settings']['index'].get('analysis', {}))
      return DOES_NOT_EXIST