课程大纲
term: {"field": "value"} terms: {"field": ["value1", "value2"]}
sql中的in
select * from tbl where col in ("value1", "value2")
1、为帖子数据增加tag字段
POST /forum/article/_bulk { "update": { "_id": "1"} } { "doc" : {"tag" : ["java", "hadoop"]} } { "update": { "_id": "2"} } { "doc" : {"tag" : ["java"]} } { "update": { "_id": "3"} } { "doc" : {"tag" : ["hadoop"]} } { "update": { "_id": "4"} } { "doc" : {"tag" : ["java", "elasticsearch"]} }
2、搜索articleID为KDKE-B-9947-#kL5或QQPX-R-3956-#aD8的帖子,搜索tag中包含java的帖子
GET /forum/article/_search { "query": { "constant_score": { "filter": { "terms": { "articleID": [ "KDKE-B-9947-#kL5", "QQPX-R-3956-#aD8" ] } } } } }
GET /forum/article/_search { "query" : { "constant_score" : { "filter" : { "terms" : { "tag" : ["java"] } } } } } "took": 2, "timed_out": false, "_shards": { "total": 5, "successful": 5, "failed": 0 }, "hits": { "total": 3, "max_score": 1, "hits": [ { "_index": "forum", "_type": "article", "_id": "2", "_score": 1, "_source": { "articleID": "KDKE-B-9947-#kL5", "userID": 1, "hidden": false, "postDate": "2017-01-02", "tag": [ "java" ] } }, { "_index": "forum", "_type": "article", "_id": "4", "_score": 1, "_source": { "articleID": "QQPX-R-3956-#aD8", "userID": 2, "hidden": true, "postDate": "2017-01-02", "tag": [ "java", "elasticsearch" ] } }, { "_index": "forum", "_type": "article", "_id": "1", "_score": 1, "_source": { "articleID": "XHDK-A-1293-#fJ3", "userID": 1, "hidden": false, "postDate": "2017-01-01", "tag": [ "java", "hadoop" ] } } ] } }
3、优化搜索结果,仅仅搜索tag只包含java的帖子
POST /forum/article/_bulk { "update": { "_id": "1"} } { "doc" : {"tag_cnt" : 2} } { "update": { "_id": "2"} } { "doc" : {"tag_cnt" : 1} } { "update": { "_id": "3"} } { "doc" : {"tag_cnt" : 1} } { "update": { "_id": "4"} } { "doc" : {"tag_cnt" : 2} } GET /forum/article/_search { "query": { "constant_score": { "filter": { "bool": { "must": [ { "term": { "tag_cnt": 1 } }, { "terms": { "tag": ["java"] } } ] } } } } } ["java", "hadoop", "elasticsearch"]
4、学到的知识点梳理
(1)terms多值搜索
(2)优化terms多值搜索的结果
(3)相当于SQL中的in语句
详情请观看视频讲解:http://www.roncoo.com/course/view/f6c7d5f0eef34b20b280621e42facbcf