構建資料

client.prepareIndex("company", "employee", "1")
                .setSource(XContentFactory.jsonBuilder()
                        .startObject()
                        .field("name", "jack")
                        .field("age", 27)
                        .field("position", "technique software")
                        .field("country", "china")
                        .field("join_date", "2017-01-01")
                        .field("salary", 10000)
                        .endObject())
                .get();

        client.prepareIndex("company", "employee", "2")
                .setSource(XContentFactory.jsonBuilder()
                        .startObject()
                        .field("name", "marry")
                        .field("age", 35)
                        .field("position", "technique manager")
                        .field("country", "china")
                        .field("join_date", "2017-01-01")
                        .field("salary", 12000)
                        .endObject())
                .get();

        client.prepareIndex("company", "employee", "3")
                .setSource(XContentFactory.jsonBuilder()
                        .startObject()
                        .field("name", "tom")
                        .field("age", 32)
                        .field("position", "senior technique software")
                        .field("country", "china")
                        .field("join_date", "2016-01-01")
                        .field("salary", 11000)
                        .endObject())
                .get();

        client.prepareIndex("company", "employee", "4")
                .setSource(XContentFactory.jsonBuilder()
                        .startObject()
                        .field("name", "jen")
                        .field("age", 25)
                        .field("position", "junior finance")
                        .field("country", "usa")
                        .field("join_date", "2016-01-01")
                        .field("salary", 7000)
                        .endObject())
                .get();

        client.prepareIndex("company", "employee", "5")
                .setSource(XContentFactory.jsonBuilder()
                        .startObject()
                        .field("name", "mike")
                        .field("age", 37)
                        .field("position", "finance manager")
                        .field("country", "usa")
                        .field("join_date", "2015-01-01")
                        .field("salary", 15000)
                        .endObject())
                .get();
 

開啟正排索引

PUT /company
{
  "mappings": {
      "employee": {
        "properties": {
          "age": {
            "type": "long"
          },
          "country": {
            "type": "text",
            "fields": {
              "keyword": {
                "type": "keyword",
                "ignore_above": 256
              }
            },
            "fielddata": true
          },
          "join_date": {
            "type": "date"
          },
          "name": {
            "type": "text",
            "fields": {
              "keyword": {
                "type": "keyword",
                "ignore_above": 256
              }
            }
          },
          "position": {
            "type": "text",
            "fields": {
              "keyword": {
                "type": "keyword",
                "ignore_above": 256
              }
            }
          },
          "salary": {
            "type": "long"
          }
        }
      }
    }
}
 

需求

（1）首先按照country國家來進行分組
（2）然後在每個country分組內，再按照入職年限進行分組
（3）最後計算每個分組內的平均薪資