格式：
"range": { "FIELD": { "gte": 10, "lte": 20 }类似于SQL中的between、大于等于、小于等于之类的范围筛选
准备数据：
POST /forum/_bulk{ "index": { "_id": 1 }}{ "articleID" : "XHDK-A-1293-#fJ3", "userID" : 1, "hidden": false, "postDate": "2017-01-01" }{ "index": { "_id": 2 }}{ "articleID" : "KDKE-B-9947-#kL5", "userID" : 1, "hidden": false, "postDate": "2017-01-02" }{ "index": { "_id": 3 }}{ "articleID" : "JODL-X-1937-#pV7", "userID" : 2, "hidden": false, "postDate": "2017-01-01" }{ "index": { "_id": 4 }}{ "articleID" : "QQPX-R-3956-#aD8", "userID" : 2, "hidden": true, "postDate": "2017-01-02" }1、为帖子数据增加浏览量的字段
POST /forum/_bulk{ "update": { "_id": "1"} }{ "doc" : {"view_cnt" : 30} }{ "update": { "_id": "2"} }{ "doc" : {"view_cnt" : 50} }{ "update": { "_id": "3"} }{ "doc" : {"view_cnt" : 100} }{ "update": { "_id": "4"} }{ "doc" : {"view_cnt" : 80} }2、搜索浏览量在30~60之间的帖子
GET /forum/_search{ "query": { "constant_score": { "filter": { "range": { "view_cnt": { "gte": 30, "lte": 60 } } } } }}{ "took" : 561, "timed_out" : false, "_shards" : { "total" : 1, "successful" : 1, "skipped" : 0, "failed" : 0 }, "hits" : { "total" : { "value" : 2, "relation" : "eq" }, "max_score" : 1.0, "hits" : [ { "_index" : "forum", "_type" : "_doc", "_id" : "1", "_score" : 1.0, "_source" : { "articleID" : "XHDK-A-1293-#fJ3", "userID" : 1, "hidden" : false, "postDate" : "2017-01-01", "tag" : [ "java", "hadoop" ], "tag_cnt" : 2, "view_cnt" : 30 } }, { "_index" : "forum", "_type" : "_doc", "_id" : "2", "_score" : 1.0, "_source" : { "articleID" : "KDKE-B-9947-#kL5", "userID" : 1, "hidden" : false, "postDate" : "2017-01-02", "tag" : [ "java" ], "tag_cnt" : 1, "view_cnt" : 50 } } ] }}3、搜索发帖日期在最近1个月的帖子
POST /forum/_bulk{ "index": { "_id": 5 }}{ "articleID" : "DHJK-B-1395-#Ky5", "userID" : 3, "hidden": false, "postDate": "2019-05-30", "tag": ["elasticsearch"], "tag_cnt": 1, "view_cnt": 10 }准备一条数据，之前时间比较老了
GET /forum/_search{ "query": { "constant_score": { "filter": { "range": { "postDate": { "gte": "now-30d" } } } } }}{ "took" : 369, "timed_out" : false, "_shards" : { "total" : 1, "successful" : 1, "skipped" : 0, "failed" : 0 }, "hits" : { "total" : { "value" : 1, "relation" : "eq" }, "max_score" : 1.0, "hits" : [ { "_index" : "forum", "_type" : "_doc", "_id" : "5", "_score" : 1.0, "_source" : { "articleID" : "DHJK-B-1395-#Ky5", "userID" : 3, "hidden" : false, "postDate" : "2019-05-30", "tag" : [ "elasticsearch" ], "tag_cnt" : 1, "view_cnt" : 10 } } ] }}