class_docstr: Primary DataFrame-based loading data from elastic search interface,
  defining API to read data from ES to DataFrame.
code: def __init__(self):
      pass
  
file_path: analytics-zoo/pyzoo/zoo/orca/data/elastic_search.py
imports: from zoo.orca import OrcaContext
  from zoo.common.nncontext import init_nncontext
label_desc: Use image node_id 1 to create a new elastic_search object  with example: obj = elastic_search()