Elastic Search 基於groovy指令碼進行partial update

概述

• es，其實是有個內建的指令碼支援的，可以基於groovy指令碼實現各種各樣的複雜操作
• 基於groovy指令碼，如何執行partial update
• es scripting module

例子

PUT /test_index/test_type/11
{
  "num": 0,
  "tags": []
}

1）內建指令碼

POST /test_index/test_type/11/_update
{
   "script" : "ctx._source.num+=1"
}

{
  "_index": "test_index",
  "_type": "test_type",
  "_id": "11",
  "_version": 2,
  "found": true,
  "_source": {
    "num": 1,
    "tags": []
  }
}
 

2）外部指令碼

• 新增檔案 config/scripts/test-add-tags.groovy

ctx._source.tags+=new_tag

POST /test_index/test_type/11/_update
{
  "script": {
    "lang": "groovy", 
    "file": "test-add-tags",
    "params": {
      "new_tag": "tag1"
    }
  }
}

3）用指令碼刪除文件

ctx.op = ctx._source.num == count ? 'delete' : 'none'

POST /test_index/test_type/11/_update
{
  "script": {
    "lang": "groovy",
    "file": "test-delete-document",
    "params": {
      "count": 1
    }
  }
}
 

4）upsert操作

POST /test_index/test_type/11/_update
{
  "doc": {
    "num": 1
  }
}

{
  "error": {
    "root_cause": [
      {
        "type": "document_missing_exception",
        "reason": "[test_type][11]: document missing",
        "index_uuid": "6m0G7yx7R1KECWWGnfH1sw",
        "shard": "4",
        "index": "test_index"
      }
    ],
    "type": "document_missing_exception",
    "reason": "[test_type][11]: document missing",
    "index_uuid": "6m0G7yx7R1KECWWGnfH1sw",
    "shard": "4",
    "index": "test_index"
  },
  "status": 404
}
 

如果指定的document不存在，就執行upsert中的初始化操作；如果指定的document存在，就執行doc或者script指定的partial update操作

POST /test_index/test_type/11/_update
{
   "script" : "ctx._source.num+=1",
   "upsert": {
       "num": 0,
       "tags": []
   }
}