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ElasticsearchにおけるMapping の使い方

Last updated at Posted at 2021-12-24

#1. そもそもMappingの確認/登録はどうやるの
##■ Mappingを登録するとき
Mappingに関するJSONをPUTで投げるだけ。

PUT /test_index
{
  "mappings": {
    "properties": {
      "name": { "type": "text" },
      "team": { 
        "type": "text",
        "fields": {
          "raw": {
            "type": "keyword",
            "ignore_above": 256
          }
        }
      }
    }
  }
}

##■ Mappingを確認するとき
Mappingに関するGETで投げると、Mappingに関するJSONが返ってくる。

GET /test_index/_mapping?pretty

# レスポンス
{
   "test_index": {
      "mappings": {
         "properties": {
            "name": {
               "type": "text"
            },
            "team": {
               "type": "text",
               "fields": {
                    "raw": {
                        "type": "keyword",
                        "ignore_above": 256
                     }
                }
             }
         }
      }
   }
}

#2. Mappingの読み方

データ・タイプは複数指定できる

 取り込みデータ.json
{
   "name":"hogehoge",
   "team":"A"
}

図1.png

データに連想配列があるとき

 取り込みデータ.json
{
   "name":"hogehoge",
    [
       {
          "team":"A",
          "position":"wingback"
       },
       {
          "team":"B",
          "position":"goalkeeper"
       }
     ]
}

図2.png

#メモ
curlでも投げられる。KibanaのDevToolにcurl -XGET /test/_mapping?pretty
をコピペすると自動的に、GET /test/_mapping?pretty にしてくれる。なんだこの機能。

#参考
https://baubaubau.hatenablog.com/entry/2020/07/02/203000

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