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ElasticSearch Script基础介绍

语法

"script": {"lang":   "...",  "source" | "id": "...", "params": { ... } }

参数说明：

字段	说明
lang	脚本使用的语言，默认是painless
source	脚本的核心部分，id应用于：stored script
params	传递给脚本使用的变量参数

Script有许多场景使用，比如update、update-by-query、reindex等，结合scripts语法说，lang会有painless、expression、mustache等选择；source中有ctx、doc[‘field_name’]、_source等方式取值。

基础用法

List类型数据新增、删除

添加数据到List

PUT test/_doc/1{"counter" : 1,"tags" : ["red"]}

使用Script添加数据到List

 POST test/_update/1{"script" : {"source": "ctx._source.tags.add(params.tag)","lang": "painless","params" : {"tag" : "blue"}}}

使用Script删除List数据

    POST test/_update/1{"script": {"source": "if (ctx._source.tags.contains(params.tag)) { ctx._source.tags.remove(ctx._source.tags.indexOf(params.tag)) }","lang": "painless","params": {"tag": "blue"}}}

nested数据新增、删除

新增nested类型数据

POST group/_update/50Bh5H8BmwYplCYFGcvg
{"script" : {"source": "ctx._source.user.add(params.user)","lang": "painless","params": {"user": 	{"userId":"3005","userName":"小卡","content":"不返回具体数据。"}}}
}

删除nested类型数据

POST group/_update_by_query
{"script" : {"source": "ctx._source.user.removeIf(item -> item.userId == params.userId)","lang": "painless","params": {"userId": "3003"}},"query": {"term": {"user.content.keyword": {"value": "不返回具体数据。"}}}
}

根据指定条件修改数据

SQL含义：

update operator_ip_segment_index set owned_network = '广电网' where owned_network.keyword = '新疆伊犁哈萨克自治州';

DSL语法：

curl -XPOST http://8.9.60.9:9200/operator_ip_segment_index/_update_by_query -H 'Content-Type: application/json' -d'
{"script":{"source":"ctx._source.owned_network = params.owned_network","params":{"owned_network":"广电网"},"lang":"painless"},"query":{"term":{"owned_network.keyword":"新疆伊犁哈萨克自治州"}}
}
'

根据指定条件修改多个字段数据-查询条件也使用脚本

POST operator_ip_segment_index/_update_by_query
{"script":{"source":"""ctx._source['ip_type_code']=null;ctx._source['start_ipv4_num']=null;"""},"query": {"bool": {"should": {"script": {"script": {"source": """long times = System.currentTimeMillis()/1000 - 60 * 60 * 24;doc['update_time_seconds'].value <= times""", "lang": "painless"}}}}}
}

根据指定条件删除nested中子数据

数据

{"took" : 3,"timed_out" : false,"_shards" : {"total" : 1,"successful" : 1,"skipped" : 0,"failed" : 0},"hits" : {"total" : {"value" : 1,"relation" : "eq"},"max_score" : 0.8025915,"hits" : [{"_index" : "group","_type" : "_doc","_id" : "ri8VboYBHSuebtDIpIft","_score" : 0.8025915,"_source" : {"groupName" : "聊天2群","groupId" : "1002","user" : [{"userName" : "小王2","userId" : "3002","content" : "2作为一级筛选条件单独使用表示，表示只返回聚合结果，不返回具体数据。"},{"userName" : "小张2","userId" : "3003","content" : "2作为一级筛选条件单独使用表示，表示只返回聚合结果，不返回具体数据。"},{"userName" : "小卡","userId" : "说啥呢","content" : "不返回具体数据。"}]}}]}
}

根据条件删除数据

查询user.content.keyword = 不返回具体数据。的数据，并删除，nested中userId=3003的子数据

POST group/_update_by_query
{"script" : {"source": "ctx._source.user.removeIf(item -> item.userId == params.userId)","lang": "painless","params": {"userId": "3003"}},"query": {"term": {"user.content.keyword": {"value": "不返回具体数据。"}}}
}

删除之后结果

{"took" : 3,"timed_out" : false,"_shards" : {"total" : 1,"successful" : 1,"skipped" : 0,"failed" : 0},"hits" : {"total" : {"value" : 1,"relation" : "eq"},"max_score" : 0.8025915,"hits" : [{"_index" : "group","_type" : "_doc","_id" : "ri8VboYBHSuebtDIpIft","_score" : 0.8025915,"_source" : {"groupName" : "聊天2群","groupId" : "1002","user" : [{"userName" : "小王2","userId" : "3002","content" : "2作为一级筛选条件单独使用表示，表示只返回聚合结果，不返回具体数据。"},{"userName" : "小卡","userId" : "说啥呢","content" : "不返回具体数据。"}]}}]}
}

创建脚本，通过脚本调用

根据条件查询出数据，删除nested子对象数据

创建删除脚本,id为delete-nested-test

POST _scripts/delete-nested-test
{"script":{"lang":"painless","source":"ctx._source.user.removeIf(item -> item.userId == params.userId)"}
}

使用delete-nested-test脚本，删除nested，user.userId等于888的子对象数据

POST group/_update_by_query
{"script": {"id":"delete-nested-test","params":{"userId":"888"}},"query": {"term": {"user.content.keyword": {"value": "不返回具体数据。"}}}
}