elasticsearch - 通过脚本访问文本关键字字段

Question

我正在尝试在Elasticsearch中编写一些脚本
这是请求中JSON段的示例。

{
    "script_score": {
        "script": {
            "source": "doc.containsKey('var')?params.adder[doc['var'].keyword]:0 ",
            "params": {
                "adder": {
                    "type1": 1,
                    "type2": 1000
                }
            }
        }
    },
    "weight": 100000
}

这是引发的错误

{
                "shard": 0,
                "index": "",
                "node": "4eX6EgO2QAuBdc5zkUiDBg",
                "reason": {
                    "type": "script_exception",
                    "reason": "runtime error",
                    "script_stack": [
                        "org.elasticsearch.index.mapper.TextFieldMapper$TextFieldType.fielddataBuilder(TextFieldMapper.java:759)",
                        "org.elasticsearch.index.fielddata.IndexFieldDataService.getForField(IndexFieldDataService.java:116)",
                        "org.elasticsearch.index.query.QueryShardContext.lambda$lookup$0(QueryShardContext.java:290)",
                        "org.elasticsearch.search.lookup.LeafDocLookup$1.run(LeafDocLookup.java:101)",
                        "org.elasticsearch.search.lookup.LeafDocLookup$1.run(LeafDocLookup.java:98)",
                        "java.base/java.security.AccessController.doPrivileged(AccessController.java:312)",
                        "org.elasticsearch.search.lookup.LeafDocLookup.get(LeafDocLookup.java:98)",
                        "org.elasticsearch.search.lookup.LeafDocLookup.get(LeafDocLookup.java:41)",
                        "doc.containsKey('var')?params.adder[doc['var'].keyword]:0 ",
                        "                                           ^---- HERE"
                    ],
                    "script": "doc.containsKey('var')?params.adder[doc['var'].keyword]:0 ",
                    "lang": "painless",
                    "caused_by": {
                        "type": "illegal_argument_exception",
                        "reason": "Fielddata is disabled on text fields by default. Set fielddata=true on [var] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory. Alternatively use a keyword field instead."
                    }
                }
            }

让我感到惊讶的是，由于嵌套，他们无法访问关键字字段。我是否需要创建另一个字段，即关键字字段？

谢谢

Answer 1

要访问嵌套字段，请尝试doc['var.keyword']或doc['var.keyword'].value