根据单词索引更改搜索顺序

Question

有什么方法可以增加文档开头的术语的权重吗？例如我有 3 个文件。

Medicine XXX
Sulpher This medicine contains sulpher and should be taken only after consultation with your doctor.

Medicine YYY
contains: sulpher Not recommended by most physicians

Medicine ZZZ
This medicine works like sulpher but does not contain sulpher at all.

文档 XXX 应列在搜索词 "Sulpher" 的顶部，因为这是该文档中的第一个词。如果 YYY 列在顶部就可以了，因为它与 XXX 相同。但是 ZZZ 应该永远是最后一个。换句话说，在 "left" 中找到的术语应该比在文档 "right" 侧找到的术语具有更高的优先级。

Answer 1

您可以通过小写归一化术语位置提升：

PUT sulphur
{
  "settings": {
    "analysis": {
      "normalizer": {
        "keyword_lowercase": {
          "type": "custom",
          "filter": ["lowercase"]
        }
      }
    }
  },
  "mappings": {
    "properties": {
      "text": {
        "type": "text",
        "fields": {
          "keyword": {
            "type": "keyword",
            "normalizer": "keyword_lowercase"
          }
        }
      }
    }
  }
}

POST sulphur/_doc
{"text":"This medicine works like sulpher but does not contain sulpher at all."}
POST sulphur/_doc
{"text":"contains: sulpher Not recommended by most physicians"}
POST sulphur/_doc
{"text":"Sulpher This medicine contains sulpher and should be taken only after consultation with your doctor."}

然后是

GET sulphur/_search
{
  "query": {
    "bool": {
      "must": [
        {
          "function_score": {
            "query": {
              "match": {
                "text": "sulpher"
              }
            },
            "script_score": {
              "script": """
                def pos = doc['text.keyword'].value.indexOf('sulpher');
                return Math.exp((2.0/(pos+1)))
              """
            },
            "boost_mode": "replace"
          }
        }
      ]
    }
  }
}

屈服

[
  {
    "_index":"sulphur",
    "_type":"_doc",
    "_id":"sf5S2nEBW-D5QnrWODvB",
    "_score":7.389056,
    "_source":{
      "text":"Sulpher This medicine contains sulpher and should be taken only after consultation with your doctor."
    }
  },
  {
    "_index":"sulphur",
    "_type":"_doc",
    "_id":"sP5S2nEBW-D5QnrWNjtw",
    "_score":1.1993961,
    "_source":{
      "text":"contains: sulpher Not recommended by most physicians"
    }
  },
  {
    "_index":"sulphur",
    "_type":"_doc",
    "_id":"r_5S2nEBW-D5QnrWNDuw",
    "_score":1.079959,
    "_source":{
      "text":"This medicine works like sulpher but does not contain sulpher at all."
    }
  }
]

根据单词索引更改搜索顺序

Change the search order based on word index

lucene

elasticsearch