Get all Elasticsearch records

es_fetch_all.py

#!/usr/bin/env python

# using the low-level elasticsearch-py client. Works for 6.3
from elasticsearch.helpers import scan  # abstraction for scroll()

# assuming `es_obj` is an `Elasticsearch` instance 
doc_generator = scan(
    es_obj,
    query={"query": {"match_all": {}}},
    index="my-index",
)

# use the generator to iterate, making a list will occupy lots of RAM
for doc in doc_generator:
    # use it somehow
    print(doc)