将ElasticSearch聚合限制为前n个查询结果 [英] Limit ElasticSearch aggregation to top n query results

问题描述

我有一套280万个文档，我使用ElasticSearch查询的标签集，但是这些文档中的许多可以通过一个ID分组在一起。我想使用标签查询我的数据，然后通过重复的ID聚合它们。通常我的搜索结果有成千上万的文档，但我只想聚合搜索的前100个结果。如何将聚合约束到查询的前100个结果？

I have a set of 2.8 million docs with sets of tags that I'm querying with ElasticSearch, but many of these docs can be grouped together by one ID. I want to query my data using the tags, and then aggregate them by the ID that repeats. Often my search results have tens of thousands of documents, but I only want to aggregate the top 100 results of the search. How can I constrain an aggregation to only the top 100 results from a query?

推荐答案

采样器汇总：

过滤聚合用于限制任何子聚合处理
到最高评分文档的样本。

A filtering aggregation used to limit any sub aggregations' processing to a sample of the top-scoring documents.

"aggs": {
     "bestDocs": {
         "sampler": {
          //    "field": "<FIELD>", <-- optional, Controls diversity using a field
              "shard_size":100
         },
         "aggs": {
              "bestBuckets": {
                 "terms": {
                      "field": "id"
                  }
               }
         }
      }
  }

此查询将限制子公司从结果中获取前100个文档，然后按ID存储。

This query will limit the sub aggregation to top 100 docs from the result and then bucket them by ID.

（可选）您可以使用字段或脚本和max_docs_per_value 设置来控制在任何一个分享共同价值的分片上收集的最大文档数量。

Optionally, you can use the field or script and max_docs_per_value settings to control the maximum number of documents collected on any one shard which share a common value.

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