search_phase_execution_exception, failed to create query

Question

I am using elasticsearch-dsl in my django project. Elasticsearch is totally new for me and at some point i got this error: error

So i started debugging and removing some part of my code. But here i am my code has become extremely simple but i still don't know why i get this error.

The code:

import re

from django.conf import settings
from elasticsearch_dsl.query import Bool, Match, MatchPhrase, Nested

from .documents import RubricPageDocument


def _build_match_query(query, field):
    if len(query) <= 4:
        return Match(**{field: {'query': query}})

    if re.match('^".*"$', query):
        return MatchPhrase(**{field: {'query': query}})

    return Match(**{field: {'query': query, 'fuzziness': 'AUTO'}})


def search_query_in_rubric_pages(query):
    q_title = _build_match_query(query, 'title')

    q = q_title

    s = RubricPageDocument.search().query(q)

    response = s.execute() # error raise on this line

    return [_format_hit(hit, 'rubric') for hit in response] 


def search_query(query):
    """
    search in elastic search index for rubric pages
    * query (str): the query

    """

    page_hits = search_query_in_rubric_pages(query)

    return {
        'hits': page_hits,
    }

Please help me