ElasticSearch 脚本字段可按排序访问

Question

是否可以访问排序中的 script_field？

我有

search_body["script_fields"] = {
    "test": {
        "script": {
            "lang": "painless",
            "inline": skill_rating_algorithm.replace("\n", ""),
            "params" : {
                "param1": {....}
            }
        }
    }
}

按顺序：

search_body["sort"] = {
    "_script": {
        "type": "string",
        "order": "desc",
        "script": {
            "lang": "painless",
            "inline": "def c = params._fields['test']; return c;",
        }
    },
    "number_of_years_of_experience": {"order": "desc"},
    "value.raw": {"order": "asc"},
}

但这只会返回错误。 我可以做一个排序脚本，但我需要文档中返回的值作为单独的键。

我的问题是： 我可以访问排序中的 script_field“测试”吗？ （更多的 script_fields 将会出现，我将需要不同的排序）

Answer 1

是的，可以在排序中访问运行时字段（不是脚本字段）。让我们按月份名称降序对日期进行排序

带日期的文件

PUT /runtime_field_sort/_bulk
{"create":{"_id":1}}
{ "date": "2015-01-01" }
{"create":{"_id":2}}
{ "date": "2015-08-01" }
{"create":{"_id":3}}
{ "date": "2015-12-01" }

使用

runtime_mappings

查询并按月份名称降序排序

GET /runtime_field_sort/_search?filter_path=hits.hits
{
    "runtime_mappings": {
        "month": {
            "type": "keyword",
            "script": {
                "source": """
                    ZonedDateTime date = doc[params.date_field].value;
                    Month month = date.getMonth();
                    emit(month.toString().toLowerCase());
                """,
                "params": {
                    "date_field": "date"
                }
            }
        }
    },
    "fields": [
        "month", "date"
    ],
    "_source": false,
    "sort": [
        {
            "month": {
                "order": "desc"
            }
        }
    ]
}

回应

{
    "hits" : {
        "hits" : [
            {
                "_index" : "runtime_field_sort",
                "_type" : "_doc",
                "_id" : "1",
                "_score" : null,
                "fields" : {
                    "date" : [
                        "2015-01-01T00:00:00.000Z"
                    ],
                    "month" : [
                        "january"
                    ]
                },
                "sort" : [
                    "january"
                ]
            },
            {
                "_index" : "runtime_field_sort",
                "_type" : "_doc",
                "_id" : "3",
                "_score" : null,
                "fields" : {
                    "date" : [
                        "2015-12-01T00:00:00.000Z"
                    ],
                    "month" : [
                        "december"
                    ]
                },
                "sort" : [
                    "december"
                ]
            },
            {
                "_index" : "runtime_field_sort",
                "_type" : "_doc",
                "_id" : "2",
                "_score" : null,
                "fields" : {
                    "date" : [
                        "2015-08-01T00:00:00.000Z"
                    ],
                    "month" : [
                        "august"
                    ]
                },
                "sort" : [
                    "august"
                ]
            }
        ]
    }
}