5、结构化搜索_在案例中实战基于range filter来进行范围过滤

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} }
{ "update": { "_id": "5"} }
{ "doc" : {"view_cnt" : 70} }
{ "update": { "_id": "6"} }
{ "doc" : {"view_cnt" : 50} }
{ "update": { "_id": "7"} }
{ "doc" : {"view_cnt" : 60} }
{ "update": { "_id": "8"} }
{ "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": {
            "gt": 30,
            "lt": 60
          }
        }
      }
    }
  }
}

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": "2017-03-01", "tag": ["elasticsearch"], "tag_cnt": 1, "view_cnt": 10 }

GET /forum/_search 
{
  "query": {
    "constant_score": {
      "filter": {
        "range": {
          "postDate": {
            "gt": "2017-03-10||-30d"
          }
        }
      }
    }
  }
}

GET /forum/_search 
{
  "query": {
    "constant_score": {
      "filter": {
        "range": {
          "postDate": {
            "gt": "now-30d"
          }
        }
      }
    }
  }
}

4、梳理一下学到的知识点

（1）range，sql中的between，或者是>=1，<=1
（2）range做范围过滤