Elasticsearch 6.3.0 randomly fails to execute function_score query

Elastic Stack Elasticsearch
1

Hi,

Using my three node Elasticsearch 6.3.0 cluster I'm trying to execute the following function score query:

{"size": 400, "from": 0, "query": {"nested": {"path": "feature_vectors", "query": {"function_score": {"functions": [{"similar_score": {"feature_vectors.fine_grained.value": {"value": "mg3GopoNxqKaDWaimg1GoppdxoKaHcaivg/ooJpdxpqaDeSgmg3goL4v+KCaDeSi/if5qL4v+aj+J/mgfif5KPvufo4ZPobtUc1s6kuDM6CeNVQj793WMPvFQkkFsEtSpRcJ6o3Gcx5YpD+324FgUmFgMsjILzMlNXUeWJcqP4eFykHBvc5Sar0rSPqWNAbh4Pzm+VuAmTlrPcfNkQk0pnK7ncslGpNxtiM7SZThBhC7+qpwR2Qe+q5UIHZRczp/5NMJaYjzfk6ntFvSGxOzFgRbLJ4EMSpcqmdR5DSMIMA=", "components": [{"size": 64, "weight": 1}, {"size": 64, "weight": 1}, {"size": 64, "weight": 1}, {"size": 32, "weight": 1}]}}}], "query": {"bool": {"filter": [{"terms": {"groups": [6272]}}]}}}}}}, "_source": ["content_id_db", "image_id_db", "url"], "sort": [{"_score": "asc"}]}

Interestingly, although syntactically correct the query randomly fails executing with the following exception:

   File "./computer_vision/image_search_runtime/elasticsearch/api.py", line 192, in _search
    resp = s.execute()
  File "/usr/local/lib/python3.5/site-packages/elasticsearch_dsl/search.py", line 639, in execute
    **self._params
  File "/usr/local/lib/python3.5/site-packages/elasticsearch/client/utils.py", line 73, in _wrapped
    return func(*args, params=params, **kwargs)
  File "/usr/local/lib/python3.5/site-packages/elasticsearch/client/__init__.py", line 623, in search
    doc_type, '_search'), params=params, body=body)
  File "/usr/local/lib/python3.5/site-packages/elasticsearch/transport.py", line 312, in perform_request
    status, headers, data = connection.perform_request(method, url, params, body, ignore=ignore, timeout=timeout)
  File "/usr/local/lib/python3.5/site-packages/elasticsearch/connection/http_urllib3.py", line 128, in perform_request
    self._raise_error(response.status, raw_data)
  File "/usr/local/lib/python3.5/site-packages/elasticsearch/connection/base.py", line 125, in _raise_error
    raise HTTP_EXCEPTIONS.get(status_code, TransportError)(status_code, error_message, additional_info)
elasticsearch.exceptions.RequestError: TransportError(400, 'parsing_exception', 'no [query] registered for [function_score]')

This issue does not occur at every query execution, but instead of every fourth or fifth for instance.

What could the issue be?

2

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