Response 400 while using Scroll API with Python - scroll_id too long

[benecrom (carlo)]

Hi all,

I'm trying to leverage on the scroll API from my python application.
My python code looks like this:

es = Elasticsearch([{'host': 'elastic', 'port': '9999'}])

data = es.search(index = "index*", 
				  body = query,
				  scroll = "2m",
				  size = 1000,
				  request_timeout = 3000)

sid = data['_scroll_id']

# do something w/ current batch of hits (data) ...

while True:
	logging.info(sid)
	data = es.scroll(scroll_id=sid, scroll='2m')
	
	scroll_size = len(data['hits']['hits'])
	
	# If no data was collected stop execution
	if scroll_size == 0:
		break
	else:
		# do something w/ current batch of hits (data) ...
		
		# Update the scroll ID
		sid = data['_scroll_id']
		if batch_n % 1000 == 0:
			logging.info("Batch: {}".format(batch_n))

The query I run is as follow:

def prep_query(start_date, start_hour, end_date, end_hour):
    return """{{
      "size": 0,
      "query": {{
        "bool": {{
          "must": [
            {{
              "match_all": {{}}
            }},
            {{
              "match_phrase": {{
                "event": {{
                  "query": "STREAM"
                }}
              }}
            }},
            {{
              "range": {{
                "ts": {{
                  "gte": "{0} {1}",
                  "lte": "{2} {3}",
                  "format": "yyyy-MM-dd HH:mm:ss.SSS"
                }}
              }}
            }}
          ],
          "must_not": []
        }}
      }},
      "_source": {{
        "excludes": []
      }}
    }}""".format(start_date, start_hour, end_date, end_hour)

I'm getting an error out of this and I'm not sure how to solve it. Please also assume that I can't edit elasticsearch conf.
Here's the error:

[2019-07-17 16:08:58,857] {logging_mixin.py:95} INFO - [2019-07-17 16:08:58,856] {base.py:146} WARNING - GET http://elastic01.skytech.local:9200/_search/scroll?scroll=2m&scroll_id=DnF1ZXJ5VGhlb ..(very long hash).. Zad0E%3D [status:400 request:0.002s]
[2019-07-17 16:08:58,857] {__init__.py:1580} ERROR - RequestError(400, 'too_long_frame_exception', 'An HTTP line is larger than 4096 bytes.')

Any help on this? much appreciated! Thanks a lot guys!