I am using elasticsearch dsl to search on elasticsearch : https://elasticsearch-dsl.readthedocs.org/en/latest/
How can i filter specific fields while making a search query:
I know its supported in elasticsearch: https://www.elastic.co/guide/en/elasticsearch/reference/1.4/search-request-fields.html
Just dont know how to do the same in Elasticsearch-dsl
When you have your Search object you can call the .fields() function on it and specify which fields you want to return:
s = search.Search()
s = s.fields(["field1", "field2"])
...
It's not explicitly mentioned in the documentation, but you can see the fields function in the source for the search.py file and some test cases for the fields function
UPDATE
From ES 2.x onwards, the fields() method has been renamed to source()
fields: _all won't work if _all is disabled, have you tried it?
.fields() our .source()?In elasticsearch-dsl version 6.x.x fields() is deprecated and result with exception.
use source(fields=None, **kwargs) in order to projection columns
e.g.
s = Search()
s = s.source(["field1", "field2"])
s = Search()
s = s.source(include=['obj1.*'], exclude=["*.description"])
s = Search()
s = s.source(include=['obj1.*']).source(exclude=["*.description"])
i use that for all fields :
from elasticsearch_dsl import Q, Search
from elasticsearch import Elasticsearch
client = Elasticsearch('localhost:9200')
q = Q("multi_match", query='STRING_TO_SEARCH', fields=['_all'])
result = Search(index='YOUR_INDEX').using(client).query(q).execute()
or for specific fields :
fields=['name',]
