Elasticsearch与词干匹配

问题描述 投票:8回答:1

我如何搜索词干匹配?

即目前,item_title字段中有许多文档包含“滑板”一词,但是只有3个文档包含“滑板”一词。因此,当我执行以下搜索时:

POST /my_index/my_type/_search
{
    "size": 100,
    "query" : {
        "multi_match": {
           "query": "skateboards",
           "fields": [ "item_title^3" ]
        }
    }
}

我只得到3个结果。但是,我也希望返回带有单词“ skateboard”的文档。

根据我从Elasticsearch的了解,我希望通过在item_title字段上指定一个映射来完成此操作,该映射包含一个分析器,该分析器索引每个单词的词干版本,但是我似乎找不到有关如何为此,这表明它是以不同的方式完成的。

建议?

search elasticsearch stem
1个回答
10
投票

这里是一个例子:

PUT /stem
{
  "settings": {
    "analysis": {
      "filter": {
        "filter_stemmer": {
          "type": "stemmer",
          "language": "english"
        }
      },
      "analyzer": {
        "tags_analyzer": {
          "type": "custom",
          "filter": [
            "standard",
            "lowercase",
            "filter_stemmer"
          ],
          "tokenizer": "standard"
        }
      }
    }
  },
  "mappings": {
    "test": {
      "properties": {
        "item_title": {
          "analyzer": "tags_analyzer",
          "type": "text"
        }
      }
    }
  }
}

为一些示例文档编制索引:

POST /stem/test/1
{
  "item_title": "skateboards"
}
POST /stem/test/2
{
  "item_title": "skateboard"
}
POST /stem/test/3
{
  "item_title": "skate"
}

执行查询:

GET /stem/test/_search
{
  "query": {
    "multi_match": {
      "query": "skateboards",
      "fields": [
        "item_title^3"
      ]
    }
  },
  "fielddata_fields": [
    "item_title"
  ]
}

并查看结果:

  "hits": [
     {
        "_index": "stem",
        "_type": "test",
        "_id": "1",
        "_score": 1,
        "_source": {
           "item_title": "skateboards"
        },
        "fields": {
           "item_title": [
              "skateboard"
           ]
        }
     },
     {
        "_index": "stem",
        "_type": "test",
        "_id": "2",
        "_score": 1,
        "_source": {
           "item_title": "skateboard"
        },
        "fields": {
           "item_title": [
              "skateboard"
           ]
        }
     }
  ]

我还添加了fielddata_fields元素,以便您可以看到如何对该字段的内容进行索引。如您所见,在两种情况下,索引项均为skateboard

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