ElasticSearch--使用groovy脚本

• 内置脚本实现自增操作

1 PUT accounts/person/12
{
  "age":0
}

2 GET accounts/person/12
返回：
{
  "_index": "accounts",
  "_type": "person",
  "_id": "12",
  "_version": 2,
  "found": true,
  "_source": {
    "age": 0
  }
}

3 自增操作
POST /accounts/person/12/_update
{
  "script": "ctx._source.age+=1"
}
返回：
{
  "_index": "accounts",
  "_type": "person",
  "_id": "12",
  "_version": 3,
  "result": "updated",
  "_shards": {
    "total": 2,
    "successful": 1,
    "failed": 0
  }
}

4 查看
GET accounts/person/12
返回：
{
  "_index": "accounts",
  "_type": "person",
  "_id": "12",
  "_version": 3,
  "found": true,
  "_source": {
    "age": 1
  }
}
age完成了自增

• 外部脚本实现根据输入参数完成数组元素的增加

1 增加脚本文件路径：elasticsearch-5.2.0/config/scripts/add_tags.groovy

内容：

ctx._source.tags+=new_tag

2 发送命令

1 PUT accounts/person/13
{
  "age":0,
  "tags":[]
}

2 GET accounts/person/13
{
  "_index": "accounts",
  "_type": "person",
  "_id": "13",
  "_version": 1,
  "found": true,
  "_source": {
    "age": 0,
    "tags": []
  }
}

3 POST /accounts/person/13/_update
{
  "script": {
    "lang": "groovy", //脚本语言
    "file": "add_tags",//脚本文件名
    "params": {
      "new_tag":"xyz"//传入的参数
    }
  }
}
返回：
{
  "_index": "accounts",
  "_type": "person",
  "_id": "13",
  "_version": 2,
  "result": "updated",
  "_shards": {
    "total": 2,
    "successful": 1,
    "failed": 0
  }
}

4 GET accounts/person/13
{
  "_index": "accounts",
  "_type": "person",
  "_id": "13",
  "_version": 2,
  "found": true,
  "_source": {
    "age": 0,
    "tags": [
      "xyz"
    ]
  }
}

• 外部脚本实现按照输入参数来删除document

1 增加脚本文件路径：elasticsearch-5.2.0/config/scripts/delete.groovy

内容：如果num为输入的参数，者删除

ctx.op=ctx._source.age==age?'delete':'none'

2 发送命令

1 GET accounts/person/13
返回：
{
  "_index": "accounts",
  "_type": "person",
  "_id": "13",
  "_version": 3,
  "found": true,
  "_source": {
    "age": 0,
    "tags": [
      "xyz",
      "xyz"
    ]
  }
}

2 POST /accounts/person/13/_update
{
  "script": {
    "lang": "groovy", 
    "file": "delete",
    "params": {
      "age":1
    }
  }
}
返回：result为noop，者删除失败
{
  "_index": "accounts",
  "_type": "person",
  "_id": "13",
  "_version": 3,
  "result": "noop",
  "_shards": {
    "total": 0,
    "successful": 0,
    "failed": 0
  }
}

3 POST /accounts/person/13/_update
{
  "script": {
    "lang": "groovy", 
    "file": "delete",
    "params": {
      "age":0
    }
  }
}
返回：result为deleted，删除成功
{
  "_index": "accounts",
  "_type": "person",
  "_id": "13",
  "_version": 4,
  "result": "deleted",
  "_shards": {
    "total": 2,
    "successful": 1,
    "failed": 0
  }
}

4 GET accounts/person/13
返回
{
  "_index": "accounts",
  "_type": "person",
  "_id": "13",
  "found": false
}

• upsert: 如果修改的document不存在，就执行upsert中的初始化操作，如果存在者进行partial update操作

1 直接进行partial update操作
POST /accounts/person/15/_update
{
  "doc": {
    "age":10
  }
}
返回错误：
{
  "error": {
    "root_cause": [
      {
        "type": "document_missing_exception",
        "reason": "[person][15]: document missing",
        "index_uuid": "qgPjJUv6Sm-VBesoOMlNPA",
        "shard": "2",
        "index": "accounts"
      }
    ],
    "type": "document_missing_exception",
    "reason": "[person][15]: document missing",
    "index_uuid": "qgPjJUv6Sm-VBesoOMlNPA",
    "shard": "2",
    "index": "accounts"
  },
  "status": 404
}

2 增加upsert参数
POST /accounts/person/15/_update
{
  "doc": {
    "age":10
  },
  "upsert": {
    "age":0
  }
}
返回：
{
  "_index": "accounts",
  "_type": "person",
  "_id": "15",
  "_version": 1,
  "result": "created",
  "_shards": {
    "total": 2,
    "successful": 1,
    "failed": 0
  }
}

3 GET accounts/person/15
返回：
{
  "_index": "accounts",
  "_type": "person",
  "_id": "15",
  "_version": 1,
  "found": true,
  "_source": {
    "age": 0//age为upsert中初始化的内容
  }
}

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