概述
继续跟中华石杉老师学习ES，第55篇
课程地址： https://www.roncoo.com/view/55
官网
Top Hits Aggregation : 戳这里
其他详见官网
示例
需求： 对每个用户发表的博客进行分组
模拟一批数据
PUT /blogs2/blogs2/2 { "title": "2跟石杉老师学ES", "content": "2-second blog", "userInfo": { "userId": 2, "username": "2小工匠" } } PUT /blogs2/blogs2/3 { "title": "3跟石杉老师学ES", "content": "3-second blog", "userInfo": { "userId": 3, "username": "3小工匠" } } PUT /blogs2/blogs2/4 { "title": "4跟石杉老师学ES", "content": "4-second blog", "userInfo": { "userId": 4, "username": "4小工匠" } } PUT /blogs2/blogs2/5 { "title": "5跟石杉老师学ES", "content": "5-second blog", "userInfo": { "userId": 2, "username": "2小工匠" } } PUT /blogs2/blogs2/6 { "title": "6跟石杉老师学ES", "content": "6-second blog", "userInfo": { "userId": 3, "username": "3小工匠" } } PUT /blogs2/blogs2/7 { "title": "7跟石杉老师学ES", "content": "7-second blog", "userInfo": { "userId": 4, "username": "4小工匠" } }
DSL
#对每个用户发表的博客进行分组,取前5篇的标题 GET /blogs2/blogs2/_search { "size": 0, "aggs": { "group_by_userName": { "terms": { "field": "userInfo.username.keyword" }, "aggs": { "top_blog": { "top_hits": { "_source": { "includes": "title" }, "size": 5 } } } } } }
返回：
{ "took": 9, "timed_out": false, "_shards": { "total": 5, "successful": 5, "skipped": 0, "failed": 0 }, "hits": { "total": 7, "max_score": 0, "hits": [] }, "aggregations": { "group_by_userName": { "doc_count_error_upper_bound": 0, "sum_other_doc_count": 0, "buckets": [ { "key": "2小工匠", "doc_count": 2, "first_blog": { "hits": { "total": 2, "max_score": 1, "hits": [ { "_index": "blogs2", "_type": "blogs2", "_id": "5", "_score": 1, "_source": { "title": "5跟石杉老师学ES" } }, { "_index": "blogs2", "_type": "blogs2", "_id": "2", "_score": 1, "_source": { "title": "2跟石杉老师学ES" } } ] } } }, { "key": "3小工匠", "doc_count": 2, "first_blog": { "hits": { "total": 2, "max_score": 1, "hits": [ { "_index": "blogs2", "_type": "blogs2", "_id": "6", "_score": 1, "_source": { "title": "6跟石杉老师学ES" } }, { "_index": "blogs2", "_type": "blogs2", "_id": "3", "_score": 1, "_source": { "title": "3跟石杉老师学ES" } } ] } } }, { "key": "4小工匠", "doc_count": 2, "first_blog": { "hits": { "total": 2, "max_score": 1, "hits": [ { "_index": "blogs2", "_type": "blogs2", "_id": "4", "_score": 1, "_source": { "title": "4跟石杉老师学ES" } }, { "_index": "blogs2", "_type": "blogs2", "_id": "7", "_score": 1, "_source": { "title": "7跟石杉老师学ES" } } ] } } }, { "key": "小工匠", "doc_count": 1, "first_blog": { "hits": { "total": 1, "max_score": 1, "hits": [ { "_index": "blogs2", "_type": "blogs2", "_id": "1", "_score": 1, "_source": { "title": "跟石杉老师学ES" } } ] } } } ] } } }
