elasticsearch查詢時不區分大小寫

Elastic 默認是區分大小寫查詢的，比如：

{
  "foo": "BÀR"
}

查詢的時候 通過“bar”是查詢不到的，需要在

"settings": {

    "analysis": { 
      "normalizer": { 
        "my_normalizer": { 
          "type": "custom", 
          "filter": ["lowercase", "asciifolding"] 
        } 
      } 
    } 
  },   
   "mappings": { 
    "type": { 
      "properties": { 
        "foo": { 
          "type": "keyword", 
          "normalizer": "my_normalizer" 
        } 
      } 
    } 
  } 

案例:

PUT /products
{
  "settings": {     
    "analysis": { 
      "normalizer": { 
        "my_normalizer": { 
          "type": "custom", 
          "filter": ["lowercase", "asciifolding"] 
        } 
      } 
    } 
  }
}

POST /products/doc/_mapping
{
  "_source": {"enabled": true},
  "dynamic": true,
  "properties" : {
    "id" : {"type" : "text","fields": {"raw": {"type": "keyword","ignore_above": 256}}},
    "hash" : {"type" : "text","fields": {"raw": {"type": "keyword","ignore_above": 256}}},
    "name" : {"type" : "keyword","doc_values":true,"normalizer": "my_normalizer"},
    "type" : {"type" : "keyword","doc_values":true},
    "fileids": {"type": "text","fields": {"raw": {"type": "keyword","ignore_above": 256}}},
    "createTime": {"type": "date"},
    "updateTime": {"type": "date"},
    "info" : {
      "properties":{              
            "id":{ "type":"text","fields": {"raw": {"type": "keyword","ignore_above": 256}}},
            "label":{"type":"keyword","doc_values":true,"normalizer": "my_normalizer"},
            "format":{ "type":"keyword","doc_values":true,"normalizer": "my_normalizer"},
            "value" : {"type" : "text","fields": {"raw": {"type": "keyword","ignore_above": 256}}}
     }
   }
 } 
}

這樣就可以解決大小寫的問題。

ES 6.0 官網資料：https://www.elastic.co/guide/en/elasticsearch/reference/6.0/normalizer.html