How to do query elastic search on multiple index

[umaparvat]

Questions

I'm working on global search which has to search on all the elastic search index and show the response. i'm referring this page for developing API . API
`
class PaginatedElasticSearchAPIView(APIView, LimitOffsetPagination):
serializer_class = None
document_class = None
@abc.abstractmethod
def generate_q_expression(self, query):
"""This method should be overridden
and return a Q() expression."""

def get(self, request, query):
try:
q = self.generate_q_expression(query)
search = self.document_class.search().query(q)
response = search.execute()

print(f'Found {response.hits.total.value} hit(s) for query: "{query}"')

results = self.paginate_queryset(response, request, view=self)
serializer = self.serializer_class(results, many=True)
return self.get_paginated_response(serializer.data)

except Exception as e:
return HttpResponse(e, status=500)
`

In views.py

`
class SearchUsers(PaginatedElasticSearchAPIView):
serializer_class = UserSerializer
document_class = UserDocument

def generate_q_expression(self, query):
return Q('bool',
should=[
Q('match', username=query),
Q('match', first_name=query),
Q('match', last_name=query),
], minimum_should_match=1)
class SearchCategories(PaginatedElasticSearchAPIView):
serializer_class = CategorySerializer
document_class = CategoryDocument

def generate_q_expression(self, query):
return Q(
'multi_match', query=query,
fields=[
'name',
'description',
], fuzziness='auto')
`

The elastic search document

`

blog/documents.py
from django.contrib.auth.models import User
from django_elasticsearch_dsl import Document, fields
from django_elasticsearch_dsl.registries import registry

from blog.models import Category, Article

@registry.register_document
class UserDocument(Document):
class Index:
name = 'users'
settings = {
'number_of_shards': 1,
'number_of_replicas': 0,
}

class Django:
model = User
fields = [
'id',
'first_name',
'last_name',
'username',
]
`
the above code queries only particular document class.

How to query on the multiple index and get the result similar to the below elastic search api call using django-ealsticsearch-dsl ?

In elastic search we have multi index query
GET /user,categories/_search { "query": { "match": { "user.id": "kim" } } }

or

GET /*/_search { "query": { "match": { "user.id": "kim" } } }

[barseghyanartur]

It's a tricky question. Multiple indexes are not supported by this library, although they are well supported by Elasticsearch and you could simply write a custom backend to fulfill your needs. That would require some low-level digging/debugging.