Question

我有以下映射：http://pastebin.com/FgtC5aaw（包括样本数据）

http://localhost:9200/databases/database/1

{
 "columns": [
   {
     "name": "First column",
     "position": 1
   },
   {
     "name": "Second column",
     "position": 2
   },
   {
     "name": "Third column",
     "position": 3
   }
 ],
 "name": "Database name"
}

我想要的是＆＃34;数据库＆＃34;文档，但每个列的列按列排序按降序排列。所以：

{
    "name": "Database name",
    "columns": [
        {
            "name": "Third column",
            "position": 3
        },
        {
            "name": "Second column",
            "position": 2
        },
        {
            "name": "First column",
            "position": 1
        }
    ]
}

我尝试使用＆＃34; sort＆＃34; on＆＃34; columns.position＆＃34;，但我认为它只会排序所有＆＃34;数据库＆＃34;它上面的文档的嵌套列。

Elasticsearch可以得到这样的结果吗？

Answer 1

如果您事先知道，您将始终需要按nested的降序检索列columns.position对象，您只需使用columns列表索引数据库文档已正确排序。

如果情况并非如此，则有一种方法可以使用inner_hits对嵌套的columns列表进行排序：

curl -XPOST localhost:9200/databases/database/_search -d '{
  "_source": false,            <---- set this to true to get database fields too
  "query": {
    "nested": {
      "path": "columns",
      "query": {
        "match_all": {}
      },
      "inner_hits": {
        "sort": {
          "columns.position": "desc"
        }
      }
    }
  }
}'

将产生：

{
  ...
  "hits" : {
    "total" : 1,
    "max_score" : 1.0,
    "hits" : [ {
      "_index" : "databases",
      "_type" : "database",
      "_id" : "1",
      "_score" : 1.0,
      "inner_hits" : {
        "columns" : {
          "hits" : {
            "total" : 3,
            "max_score" : null,
            "hits" : [ {
              "_index" : "databases",
              "_type" : "database",
              "_id" : "1",
              "_nested" : {
                "field" : "columns",
                "offset" : 2
              },
              "_score" : null,
              "_source":{"name":"Third column","position":3},
              "sort" : [ 3 ]
            }, {
              "_index" : "databases",
              "_type" : "database",
              "_id" : "1",
              "_nested" : {
                "field" : "columns",
                "offset" : 1
              },
              "_score" : null,
              "_source":{"name":"Second column","position":2},
              "sort" : [ 2 ]
            }, {
              "_index" : "databases",
              "_type" : "database",
              "_id" : "1",
              "_nested" : {
                "field" : "columns",
                "offset" : 0
              },
              "_score" : null,
              "_source":{"name":"First column","position":1},
              "sort" : [ 1 ]
            } ]
          }
        }
      }
    } ]
  }
}

获取带有已排序嵌套对象的文档

1 个答案: