Elasticsearch模糊查询 - 最大的修改如预期

Question

我最近增加“模糊操作”和模糊查询等设置到我们的搜索查询字符串覆盖用户误输入（如“zamestnanost”与“zamestnani”不起作用）

POST /my_index/_search 
{ 
    "query": { 
     "query_string": { 
     "query": "+(content:zamestnanost~)", 
     "fuzzy_prefix_length": 3, 
     "fuzzy_min_sim": 0.5, 
     "fuzzy_max_expansions": 50 
     } 
    } 
} 

按照我的理解模糊查询设置，fuzzy_min_sim = 0.5应该允许在这种情况下6编辑）原始查询（的length(query)*0.5编辑。

但是，它不匹配，甚至 “更近” 字（标记），如

• “zamestnani”
• “zamestnany”

我有这种奇怪的感觉，它仍然只匹配索引中最大的单词。来自原始查询字符串的2个编辑（这是模​​糊查询中的默认编辑计数）。

我也对我的查询进行了解释，结果支持这个假设，我想。该_explanation看起来是这样的：

"_explanation": { 
    "value": 0.057083897, 
    "description": "sum of:", 
    "details": [ 
     { 
     "value": 0.023866946, 
     "description": "weight(content:zamestnano^0.8 in 0) [PerFieldSimilarity], result of:", 
     "details": [ 
      { 
       "value": 0.023866946, 
       "description": "score(doc=0,freq=4.0), product of:", 
       "details": [ 
        { 
        "value": 0.66062796, 
        "description": "queryWeight, product of:", 
        "details": [ 
         { 
          "value": 0.8, 
          "description": "boost" 
         }, 
         { 
          "value": 4.624341, 
          "description": "idf(docFreq=1, maxDocs=75)" 
         }, 
         { 
          "value": 0.17857353, 
          "description": "queryNorm" 
         } 
        ] 
        }, 
        { 
        "value": 0.036127664, 
        "description": "fieldWeight in 0, product of:", 
        "details": [ 
         { 
          "value": 2, 
          "description": "tf(freq=4.0), with freq of:", 
          "details": [ 
           { 
           "value": 4, 
           "description": "termFreq=4.0" 
           } 
          ] 
         }, 
         { 
          "value": 4.624341, 
          "description": "idf(docFreq=1, maxDocs=75)" 
         }, 
         { 
          "value": 0.00390625, 
          "description": "fieldNorm(doc=0)" 
         } 
        ] 
        } 
       ] 
      } 
     ] 
     }, 
     { 
     "value": 0.03321695, 
     "description": "weight(content:zamestnanos^0.9090909 in 0) [PerFieldSimilarity], result of:", 
     "details": [ 
      { 
       "value": 0.03321695, 
       "description": "score(doc=0,freq=6.0), product of:", 
       "details": [ 
        { 
        "value": 0.7507135, 
        "description": "queryWeight, product of:", 
        "details": [ 
         { 
          "value": 0.9090909, 
          "description": "boost" 
         }, 
         { 
          "value": 4.624341, 
          "description": "idf(docFreq=1, maxDocs=75)" 
         }, 
         { 
          "value": 0.17857353, 
          "description": "queryNorm" 
         } 
        ] 
        }, 
        { 
        "value": 0.044247173, 
        "description": "fieldWeight in 0, product of:", 
        "details": [ 
         { 
          "value": 2.4494898, 
          "description": "tf(freq=6.0), with freq of:", 
          "details": [ 
           { 
           "value": 6, 
           "description": "termFreq=6.0" 
           } 
          ] 
         }, 
         { 
          "value": 4.624341, 
          "description": "idf(docFreq=1, maxDocs=75)" 
         }, 
         { 
          "value": 0.00390625, 
          "description": "fieldNorm(doc=0)" 
         } 
        ] 
        } 
       ] 
      } 
     ] 
     } 
    ] 
} 

只查询“zamestnano”和“zemestnanos”使用模糊查询编辑创建。

我理解模糊查询设置吗？你能指出我的错误吗？

非常感谢每一个想法！

Answer 1

从the documentation：

0.0..1.0

[1.7.0]已过时在1.7.0。在Elasticsearch 2.0中将删除对相似性的支持。使用以下公式将长度（术语）*（1.0 - 模糊性）转换为编辑距离，例如模糊度为0.6，术语长度为10会导致编辑距离为4. 注意：除了模糊与此查询类似，允许的最大编辑距离为2。

并仔细检查这是使用validate API最简单的方法：

GET _validate/query?explain&index=my_index 
{ 
    "query": { 
    "query_string": { 
     "query": "+(content:zamestnanost~)", 
     "fuzzy_prefix_length": 3, 
     "fuzzy_min_sim": 0.5, 
     "fuzzy_max_expansions": 50 
    } 
    } 
} 

哪个给出了这样的结果：

"explanations": [ 
     { 
     "index": "test", 
     "valid": true, 
     "explanation": "+content:zamestnanost~2" 
     } 
    ] 

这表明实际的编辑距离ES将在使用查询：zamestnanost~2。