elasticsearch - 模糊无法正常运行(一词搜索，请参见示例)

Question

考虑以下结果:

curl -XGET 'http://localhost:9200/megacorp/employee/_search' -d 
'{ "query" : 
     {"match":  
        {"last_name": "Smith"}
     }
  }'

结果:

{
  "took": 3,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "failed": 0
  },
  "hits": {
    "total": 2,
    "max_score": 0.30685282,
    "hits": [
      {
        "_index": "megacorp",
        "_type": "employee",
        "_id": "1",
        "_score": 0.30685282,
        "_source": {
          "first_name": "John",
          "last_name": "Smith",
          "age": 25,
          "about": "I love to go rock climbing on the weekends.",
          "interests": [
            "sports",
            "music"
          ]
        }
      },
      {
        "_index": "megacorp",
        "_type": "employee",
        "_id": "2",
        "_score": 0.30685282,
        "_source": {
          "first_name": "Jane",
          "last_name": "Smith",
          "age": 25,
          "about": "I love to go rock climbing",
          "interests": [
            "sports",
            "music"
          ]
        }
      }
    ]
  }
}

现在，当我执行以下查询时:

curl -XGET 'http://localhost:9200/megacorp/employee/_search' -d 
'{ "query" : 
        {"fuzzy": 
             {"last_name": 
                  {"value":"Smitt", 
                   "fuzziness": 1
                  }
              }
         }
 }'

尽管“Smith”和“Smitt”的Levenshtein距离为1，但不会返回任何结果。结果为“Smit”的结果相同。如果我将 fuzziness的值设置为2，则会得到结果。我在这里想念什么？

Answer 1

我假设您要查询的last_name字段是经过分析的字符串。被索引的术语将是smith而不是Smith。

Returns NO results despite the Levenshtein distance of "Smith" and "Smitt" being 1.

fuzzy查询不分析项，因此实际上，您的Levenshtein距离不是1而是2:

Smitt->史密斯

史密斯->史密斯

尝试使用此映射，并且模糊度= 1的查询将起作用:

PUT /megacorp/employee/_mapping
{
  "employee":{
    "properties":{
      "last_name":{
        "type":"string",
        "index":"not_analyzed"
      }
    }
  }
}

希望这可以帮助