ElasticSearch查询未返回预期结果

Question

以下查询和索引不会返回预期结果。考虑到映射约束，我不明白，当我搜索＆＃34; ICD9＆＃34;它还返回＆＃34; I9＆＃34;的结果。和＆＃34; 9＆＃34;等等。有什么想法吗？

Here is the index mapping:
{
  "mappings": {
    "mymap": {
      "dynamic_templates": [
        {
           "codingstandard": {
              "match": "*.CodingStandard",
              "mapping": {
                 "type": "string",
                 "index": "not_analyzed"
              }
           }
        }
      ]
    }
  }
}

Here is my query:
{
  "fields": [
    "Diagnosis.CodingStandard"
  ],
  "query": {
    "query_string": {
      "query": "Diagnosis.CodingStandard:ICD9"
    }
  }
}

Here are some of my results:
"hits": {
  "total": 9778,
  "max_score": 3.501487,
  "hits": [
     {
        "_index": "myindex",
        "_type": "mymapping",
        "_id": "264235",
        "_score": 3.501487,
        "fields": {
           "Diagnosis.CodingStandard": [
              "I9"
           ]
        }
     },
     {
        "_index": "myindex",
        "_type": "mymapping",
        "_id": "264261",
        "_score": 3.501487,
        "fields": {
           "Diagnosis.CodingStandard": [
              "9"
           ]
        }
     },
etc...    

Answer 1

是的，因为你正在使用query_string，elasticsearch默认为query_string做模糊搜索。

如果您想进行精确搜索，可以使用filter而不是query_string

{
   "query":{
      "filtered":{
          "filter":{
             "term":{
                "Diagnosis.CodingStandard": "ICD9"
             }
          }
      }
   }
}