elasticsearch_dsl 响应多桶聚合答案

【问题标题】：elasticsearch_dsl response multiple bucket aggregationselasticsearch_dsl 响应多桶聚合
【发布时间】：2018-10-02 22:36:11
【问题描述】：

找到这个关于如何使用 elasticsearch_dsl Generate multiple buckets in aggregation 构建嵌套聚合的线程

有人可以展示如何遍历响应以获得第二个存储桶结果吗？

for i in s.aggregations.clients.buckets.num_servers.buckets:

不起作用，要不然怎么获取num_servers或server_list中的内容？

【问题讨论】：

标签： elasticsearch elasticsearch-dsl elasticsearch-dsl-py

【解决方案1】：

如果要循环通过第二级聚合，则需要两个循环。这是一个假设索引中有“标签”和“数字”字段的示例：

from elasticsearch import Elasticsearch
from elasticsearch_dsl import Search, A

client = Elasticsearch()

# Build a two level aggregation
my_agg = A('terms', field='label')
my_agg.bucket('number', A('terms', field='number'))

# Build and submit the query
s = Search(using=client, index="stackoverflow")
s.aggs.bucket('label', my_agg)

response = s.execute()

# Loop through the first level of the aggregation
for label_bucket in response.aggregations.label.buckets:
    print "Label: {}, {}".format(label_bucket.key, label_bucket.doc_count)

    # Loop through the 2nd level of the aggregation
    for number_bucket in label_bucket.number.buckets:
        print "  Number: {}, {}".format(number_bucket.key, number_bucket.doc_count)

会打印出这样的内容：

Label: A, 3
  Number: 2, 2
  Number: 1, 1
Label: B, 3
  Number: 3, 2
  Number: 1, 1

【讨论】：