我使用django-elasticsearch-dsl，但我遇到的问题是聚合总是向我返回空值。

我需要搜索结果的所有不同发布者和不同作者。

文档：

@registry.register_document
class BookDocument(Document):
   author = fields.ObjectField(properties={
    'name': fields.TextField(),'name_reverse': fields.TextField(),'pk': fields.IntegerField(),'slug': fields.TextField(),})
   editorial = fields.nestedField(properties={
    'name': fields.TextField(),},include_in_root=True)

  class Index:
    name = 'books'
    settings = {'number_of_shards': 1,'number_of_replicas': 0}

  class Django:
    model = Book
    fields = [
        'title','isbn',]
    related_models = [Author,Editorial]  # para asegurarnos que cuando se actualice un author,se reindexa los libros

  def get_queryset(self):
    """Not mandatory but to improve performance we can select related in one sql request"""
    return super(BookDocument,self).get_queryset().select_related(
        'author','editorial'
    )

  def get_instances_from_related(self,related_instance):
    """If related_models is set,define how to retrieve the Book instance(s) from the related model.
    The related_models option should be used with caution because it can lead in the index
    to the updating of a lot of items.
    """
    if isinstance(related_instance,Author):
        return related_instance.book_set.all()
    elif isinstance(related_instance,Editorial):
        return related_instance.book_set.all()

搜索：

from elasticsearch import Elasticsearch
from elasticsearch_dsl import Search
from elasticsearch_dsl import Q
from elasticsearch_dsl.query import MultiMatch,Match
from elasticsearch_dsl import A



s = Search(index='books')
s = s.query("match",title="SECRET")
s = s[0:20]
s = s.highlight('title')
s.aggs.bucket('by_editorial','nested',path='editorial')\
.metric('max_lines','max',field='lines')
response = s.execute()

print(response.aggregations)

for item in response.aggregations.by_editorial.buckets:
    print(item)

或者：

s = Search(index='books')
a = A('terms',field='author')
s.aggs.bucket('by_author',a)
response = s.execute()

print(response.aggregations)

for item in response.aggregations.by_author.buckets:
    print(item)

我在做什么错？具有弹性的数据是正确的。

非常感谢您！

编辑：

我找到了一种解决问题的方法，以聚合方式获取对象的所有数据：

在模型中：

@property
def agg_data(self):
    return 'id##{}~~name##{}~~slug##{}'.format(self.pk,self.name,self.slug)

在文档中：

editorial = fields.ObjectField(properties={
    'name': fields.TextField(),'agg_data': fields.TextField(
        analyzer=html_strip,fields={'raw': fields.KeywordField()}
    ),})

查询：

s = Search(index='books')
s = s.query("match",title="SECRET")
s.aggs.bucket('by_editorial','terms',field='editorial.agg_data.raw') 
response = s.execute()

获得聚合结果后，我将解析该字段以将搜索过滤器安装到网络上。