ElasticSearch的update_by_query使用

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ElasticSearch的update_by_query语句可以很方便地为原有es表修改字段和新增字段,如下面的例子所示:

1.将资产表中area为空的字段赋值为'无'

POST soc-system/_update_by_query
{
  "script": {
    "source": "ctx._source['area']='无'" 
  },
  "query": {
    "bool": {
      "must_not": [
        {
          "exists": {
            "field": "area"
          }
        }
      ]
    }
  }
}

2.添加一个网段字段,其值根据已有字段ip截取而来

POST soc-system/_update_by_query
{
  "script": {
    "source": "def a=ctx._source['ip'].lastIndexOf('.');def sec=ctx._source['ip'].substring(0,a);ctx._source['ipSection']=sec+'.0'"
  },
  "query": {
    "bool": {
      "must": [
        {
          "exists": {
            "field": "ip"
          }
        }
      ]
    }
  }
}

其中script的语法为painless,具体语法参考这里