elasticsearch - Elasticsearch 结果不符合预期

Question

我有一个使用具有以下配置的自定义分析器索引的字段

 "COMPNAYNAME" : {
          "type" : "text",
          "analyzer" : "textAnalyzer"
        }

 "textAnalyzer" : {
              "filter" : [
                "lowercase"
              ],
              "char_filter" : [ ],
              "type" : "custom",
              "tokenizer" : "ngram_tokenizer"
            }

 "tokenizer" : {
            "ngram_tokenizer" : {
              "type" : "ngram",
              "min_gram" : "2",
              "max_gram" : "3"
            }
          }

当我搜索文本“ikea”时，我得到以下结果

查询:

GET company_info_test_1/_search
{
  "query": {
    "match": {
      "COMPNAYNAME": {"query": "ikea"}
    }
  }
}

结果如下，

1.mikea
2.likeable
3.maaikeart
4.likeables
5.ikea b.v.  <------
6.likeachef
7.ikea breda <------
8.bernikeart
9.ikea duiven
10.mikea media

我预计完全匹配结果应该比其余结果得到更多提升。如果我必须使用精确匹配和模糊搜索，您能帮我建立索引的最佳方法是什么吗？

提前致谢。

Answer 1

You can use ngram tokenizer along with "search_analyzer": "standard" Refer this to know more about search_analyzer

正如@EvaldasBuinauskas 所指出的，您还可以使用 edge_ngram tokenizer在这里，如果您希望 token 仅从开始而不是从中间生成。

添加带有索引数据、映射、搜索查询和结果的工作示例

索引数据:

{ "title": "ikea b.v."}
{ "title" : "mikea" }
{ "title" : "maaikeart"}

索引映射

{
    "settings": {
        "analysis": {
            "analyzer": {
                "my_analyzer": {
                    "tokenizer": "my_tokenizer"
                }
            },
            "tokenizer": {
                "my_tokenizer": {
                    "type": "ngram",
                    "min_gram": 2,
                    "max_gram": 10,
                    "token_chars": [
                        "letter",
                        "digit"
                    ]
                }
            }
        },
        "max_ngram_diff": 50
    },
    "mappings": {
        "properties": {
            "title": {
                "type": "text",
                "analyzer": "my_analyzer",
                "search_analyzer": "standard"
            }
        }
    }
}

搜索查询:

{
    "query": {
        "match" : {
            "title" : "ikea"
        }
    }
}

搜索结果:

"hits": [
            {
                "_index": "normal",
                "_type": "_doc",
                "_id": "4",
                "_score": 0.1499838,    <-- note this
                "_source": {
                    "title": "ikea b.v."
                }
            },
            {
                "_index": "normal",
                "_type": "_doc",
                "_id": "1",
                "_score": 0.13562363,    <-- note this
                "_source": {
                    "title": "mikea"
                }
            },
            {
                "_index": "normal",
                "_type": "_doc",
                "_id": "3",
                "_score": 0.083597526,
                "_source": {
                    "title": "maaikeart"
                }
            }
        ]