elasticsearch - 按IN值列表位置排序

Question

我需要构建 flex 搜索查询，并按数组中的字段值定位进行排序。
与MySQL类似:

SELECT * FROM `comments` ORDER BY FIELD(`id`,'17','3','5','12') DESC, id DESC;

或Postgres:

SELECT * FROM comments
LEFT JOIN unnest('{12,5,3,17}'::int[]) WITH ORDINALITY t(id, ord) USING (id) ORDER  BY t.ord, id DESC;

Answer 1

您正在寻找Elasticsearch中的自定义排序
可以通过轻松的脚本来实现
这是我的工作

PUT my_test
{
  "mappings": {
    "properties": {
      "animal": {
        "type": "keyword"
      }
    }
  }
}

填充文档

POST my_test/_doc
{
  "animal": "mouse"
}
POST my_test/_doc
{
  "animal": "cat"
}
POST my_test/_doc
{
  "animal": "dog"
}

自定义排序

GET my_test/_search
{
  "query": {
    "match_all": {}
  },

    "sort": {
        "_script": {
            "type": "number",
            "script": {
                "lang": "painless",
                "source": "if(params.scores.containsKey(doc['animal'].value)) { return params.scores[doc['animal'].value];} return 100000;",
                "params": {
                    "scores": {
                        "dog": 0,
                        "cat": 1,
                        "mouse": 2
                    }
                }
            },
            "order": "asc"
        }
    }
}