#########Demo for Pipeline###############

DELETE tech_blogs

#Blog資料，包含3個欄位，tags用逗號間隔
PUT tech_blogs/_doc/1
{
  "title":"Introducing big data......",
  "tags":"hadoop,elasticsearch,spark",
  "content":"You konw, for big data"
}


# 測試split tags
POST _ingest
 
/pipeline/_simulate
{
  "pipeline": {
    "description": "to split blog tags",
    "processors": [
      {
        "split": {
          "field": "tags",
          "separator": ","
        }
      }
    ]
  },
  "docs": [
    {
      "_index": "index",
      "_id": "id",
      "_source": {
        "title": "Introducing big data......",
        
 
"tags": "hadoop,elasticsearch,spark",
        "content": "You konw, for big data"
      }
    },
    {
      "_index": "index",
      "_id": "idxx",
      "_source": {
        "title": "Introducing cloud computering",
        "tags": "openstack,k8s",
        "content": "You konw, for cloud"
      }
    }
  ]
}


#同時為文件，增加一個欄位。blog檢視量
POST _ingest
 
/pipeline/_simulate
{
  "pipeline": {
    "description": "to split blog tags",
    "processors": [
      {
        "split": {
          "field": "tags",
          "separator": ","
        }
      },

      {
        "set":{
          "field": "views",
          "value": 0
        }
      }
    ]
  },

  "docs": [
    {
      "_index":"index",
      "_id":"id",
      "_source":{
        "title":"Introducing big data......",
  "tags":"hadoop,elasticsearch,spark",
  "content":"You konw, for big data"
      }
    },


    {
      "_index":"index",
      "_id":"idxx",
      "_source":{
        "title":"Introducing cloud computering",
  "tags":"openstack,k8s",
  "content":"You konw, for cloud"
      }
    }

    ]
}



# 為ES新增一個 Pipeline
PUT _ingest/pipeline/blog_pipeline
{
  "description": "a blog pipeline",
  "processors": [
      {
        "split": {
          "field": "tags",
          "separator": ","
        }
      },

      {
        "set":{
          "field": "views",
          "value": 0
        }
      }
    ]
}

#檢視Pipleline
GET _ingest/pipeline/blog_pipeline


#測試pipeline
POST _ingest/pipeline/blog_pipeline/_simulate
{
  "docs": [
    {
      "_source": {
        "title": "Introducing cloud computering",
        "tags": "openstack,k8s",
        "content": "You konw, for cloud"
      }
    }
  ]
}

#不使用pipeline更新資料
PUT tech_blogs/_doc/1
{
  "title":"Introducing big data......",
  "tags":"hadoop,elasticsearch,spark",
  "content":"You konw, for big data"
}

#使用pipeline更新資料
PUT tech_blogs/_doc/2?pipeline=blog_pipeline
{
  "title": "Introducing cloud computering",
  "tags": "openstack,k8s",
  "content": "You konw, for cloud"
}


#檢視兩條資料，一條被處理，一條未被處理
POST tech_blogs/_search
{}

#update_by_query 會導致錯誤
POST tech_blogs/_update_by_query?pipeline=blog_pipeline
{
}

#增加update_by_query的條件
POST tech_blogs/_update_by_query?pipeline=blog_pipeline
{
    "query": {
        "bool": {
            "must_not": {
                "exists": {
                    "field": "views"
                }
            }
        }
    }
}


#########Demo for Painless###############

# 增加一個 Script Prcessor
POST _ingest/pipeline/_simulate
{
  "pipeline": {
    "description": "to split blog tags",
    "processors": [
      {
        "split": {
          "field": "tags",
          "separator": ","
        }
      },
      {
        "script": {
          "source": """
          if(ctx.containsKey("content")){
            ctx.content_length = ctx.content.length();
          }else{
            ctx.content_length=0;
          }


          """
        }
      },

      {
        "set":{
          "field": "views",
          "value": 0
        }
      }
    ]
  },

  "docs": [
    {
      "_index":"index",
      "_id":"id",
      "_source":{
        "title":"Introducing big data......",
  "tags":"hadoop,elasticsearch,spark",
  "content":"You konw, for big data"
      }
    },


    {
      "_index":"index",
      "_id":"idxx",
      "_source":{
        "title":"Introducing cloud computering",
  "tags":"openstack,k8s",
  "content":"You konw, for cloud"
      }
    }

    ]
}


DELETE tech_blogs
PUT tech_blogs/_doc/1
{
  "title":"Introducing big data......",
  "tags":"hadoop,elasticsearch,spark",
  "content":"You konw, for big data",
  "views":0
}

POST tech_blogs/_update/1
{
  "script": {
    "source": "ctx._source.views += params.new_views",
    "params": {
      "new_views":100
    }
  }
}

# 檢視views計數
POST tech_blogs/_search
{

}

#儲存指令碼在 Cluster State
POST _scripts/update_views
{
  "script":{
    "lang": "painless",
    "source": "ctx._source.views += params.new_views"
  }
}

POST tech_blogs/_update/1
{
  "script": {
    "id": "update_views",
    "params": {
      "new_views":1000
    }
  }
}


GET tech_blogs/_search
{
  "script_fields": {
    "rnd_views": {
      "script": {
        "lang": "painless",
        "source": """
          java.util.Random rnd = new Random();
          doc['views'].value+rnd.nextInt(1000);
        """
      }
    }
  },
  "query": {
    "match_all": {}
  }
}