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