弹性搜索，获取平均文档长度 [英] Elasticsearch, get average document length

问题描述

在弹性搜索中是否有更好的方法（除了发布匹配所有查询和手动平均所有返回的文档的长度）以获取特定索引的平均文档长度？

Is there any better way in elasticsearch (other than issuing a match all query and manually averaging over the length of all returned documents) to get the average document length for a specific index?

推荐答案

_大小映射字段，如果启用，应该免费给你每个文档的大小。将它与 avg 聚合结合应该可以让你满意。如下：

The _size mapping field, if enabled, should give you the size of each document for free. Combining this with the avg aggregation should get you what you want. Something like:

{
  "query" : {"match_all" : {}},
  "aggs" : {"avg_size" : {"avg" : {"terms" : {"field" : "_size"}}}}
}

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