如何从Elasticsearch Painless脚本访问术语位置/偏移量?

问题描述

我们使用AWS Elasticsearch，该版本支持版本5起的无痛脚本编写.我需要访问术语位置/偏移量在我的自定义得分脚本中.

We use AWS Elasticsearch, which support Painless scripting from version 5.I need an access to term positions/offsets in my custom score script.

在旧的Groovy脚本中，它起作用了:

In old Groovy scripting it worked:

"query": {
    "function_score": {
        "query": {"match_phrase": {"text": "life"} },
        "script_score": {
            "script": {
                "lang": "groovy",
                "inline": "termInfo=_index['text'].get('life', _POSITIONS);"
            }
        },
        "boost_mode": "multiply"
    }
}

但不适用于Painless.它返回编译错误".

But it does not work with Painless. It returns 'compile error'.

推荐答案

我希望这会有所帮助，我希望根据查询文本在文档中的位置获得分数

I hope this helps, I wanted scores based on the position of the query text in the document

{
    "query": {
        "bool": {
            "should": [
                {
                    "function_score": {
                        "query": {
                            "match_phrase_prefix": {
                                "field": "query"
                            }
                        },
                        "script_score": {
                            "script": {
                                "lang": "painless",
                                "source": "(params['_source']['field'].toLowerCase().indexOf('query'.toLowerCase())+1)"
                            }
                        },
                        "boost_mode": "max"
                    }
                }
            ]
        }
    }
}

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