您可以使用字段折叠，将结果分组到
name字段上并将
top_hits聚合器的大小设置为1。
/POST http://localhost:9200/test/dedup/_search?search_type=count&pretty=true{ "aggs":{ "dedup" : { "terms":{ "field": "name" }, "aggs":{ "dedup_docs":{"top_hits":{ "size":1} } } } }}这将返回：
{ "took" : 192, "timed_out" : false, "_shards" : { "total" : 1, "successful" : 1, "failed" : 0 }, "hits" : { "total" : 6, "max_score" : 0.0, "hits" : [ ] }, "aggregations" : { "dedup" : { "buckets" : [ { "key" : "name1", "doc_count" : 2, "dedup_docs" : { "hits" : { "total" : 2, "max_score" : 1.0, "hits" : [ { "_index" : "test", "_type" : "dedup", "_id" : "1", "_score" : 1.0, "_source":{domain: "domain1.fr", name: "name1", date: "01-01-2014"} } ] } } }, { "key" : "name2", "doc_count" : 2, "dedup_docs" : { "hits" : { "total" : 2, "max_score" : 1.0, "hits" : [ { "_index" : "test", "_type" : "dedup", "_id" : "3", "_score" : 1.0, "_source":{domain: "domain1.fr", name: "name2", date: "01-03-2014"} } ] } } }, { "key" : "name3", "doc_count" : 2, "dedup_docs" : { "hits" : { "total" : 2, "max_score" : 1.0, "hits" : [ { "_index" : "test", "_type" : "dedup", "_id" : "5", "_score" : 1.0, "_source":{domain: "domain1.fr", name: "name3", date: "01-05-2014"}} ] } } } ] } }}
