将元素追加到Eslasticsearch字段 [英] Append element to Eslasticsearch field

问题描述

如果类型不匹配，是否可以将一些元素附加到elasticsearch字段?如果我有这样的文件:

please is possible to append some element to elasticsearch field if types doesn't match? If I have document like this:

{
"counter" : 1,
"tags" : "red"
}

并且我想附加另一个标记字段，例如"blue":

and i want to append another tag field f.e "blue" like this:

{
"script" : {
    "source": "ctx._source.counter += params.newTag",
    "lang": "painless",
    "params" : {
        "newTag" : "blue"
    }
}
}

我希望得到类似以下结果:

and i want to have result similar to:

{
"counter" : 1,
"tags" : ["red", "blue"]
 }

我知道这一点:

"source": "ctx._source.counter += params.newTag"

用于将字符串追加到另一个字符串

is used for append string to another string

和这个:

"source": "ctx._source.counter.add(params.newTag)"

用于将另一个元素追加到列表.那么有什么办法可以将另一个元素附加到字符串字段呢?谢谢您的任何建议.

for appending another element to list. So is there any way how to append another element to string field ? Thank You for any suggestions.

推荐答案

您可以做的是为tags字段的类型添加一个测试，如果不是，则将其转换为数组.该脚本应该有所帮助.

What you can do is to add a test for the type of your tags field and transform it to an array if it is not. This script should help.

{
   "script" : {
     "source": "if (!(ctx._source.tags instanceof List)) {ctx._source.tags = [ctx._source.tags]} ctx._source.tags += params.newTag",
     "lang": "painless",
     "params" : {
        "newTag" : "blue"
     }
   }
}

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