1、核心的数据类型

string
byte，short，integer，long
float，double
boolean
date

2、dynamic mapping

数据类型推测的规则

true or false --> boolean
123 --> long
123.45 --> double
2017-01-01 --> date
“hello world” --> string/text

3、查看mapping

GET /index/_mapping/type

GET website/_mapping/article

响应结果

{
  "website": {
    "mappings": {
      "article": {
        "properties": {
          "author_id": {
            "type": "long"
          },
          "content": {
            "type": "text",
            "fields": {
              "keyword": {
                "type": "keyword",
                "ignore_above": 256
              }
            }
          },
          "post_date": {
            "type": "date"
          },
          "title": {
            "type": "text",
            "fields": {
              "keyword": {
                "type": "keyword",
                "ignore_above": 256
              }
            }
          }
        }
      }
    }
  }
}