from elasticsearch import Elasticsearch
import json

try:
  es = Elasticsearch(['localhost','127.0.0.1'],port=9200,maxsize=25,)
  print "Connected", es.info()
except Exception as ex:
  print "Error:", ex

doc1 = {
  "script": {
    "inline": "ctx._source.ID++",
    "lang": "painless"
  },
  "query": {
    "term": {
      "username": "user100"
    }
  }
}

# HERE I TRIED MULTIPLE WAYS BUT NONE OF THEM WORKED.
# res = es.update_by_query(index="jagan4", doc_type='1', body=doc1) # requies 4 args
# res = es.update_by_query(index="jagan4", doc_type='1', id='1' body=doc1) # no ID match, but why need id to for function.
res = es.update_by_query(index="jagan4", doc_type='1',q='username:"user100"', body=doc1)

>Traceback (most recent call last):
File "/home/jagan/Desktop/DevStack/workspace/jj.python.first/src/el-test.py", line 42, in <module>
    res = es.update_by_query(index="jagan4", doc_type='1',q='username:"user100"', body=doc1)
**AttributeError: 'Elasticsearch' object has no attribute 'update_by_query**

POST /jagan4/_update_by_query
{
  "script": {
    "inline": "ctx._source.ID++",
    "lang": "painless"
  },
  "query": {
    "term": {
      "username": "user100"
    }
  }
}