我应该如何使用Logstash操作嵌套的json输入

Question

I want to use logstash for creating an output json from my nested input json.

Assuming my input json looks something like:

{
    "firstnestedprop": {
        "secondnestedprop": {
            "thirdnestedprop": {
                "key": "value",
                "key2": "value2"
            }
        }
    }
}

I would like to output something like:

{
    "key": "value",
    "key2": "value2"
}

Or something like:

{
    "keys": ["key", "key2"],
    "values": ["value", "value2"]
}

What plugin should I use?

Can anyone provide a short example or reference me to some relevant documentation?

Answer 1

I managed to work it out using the ruby filter plugin , since my case was a bit more complicated than the example I've posted (included nested arrays and complex objects). I'm not sure if there's a better way or not, but I have tried most of the filters and the ruby filter plugin was the only one that I felt good with (the others involved regular expressions and other ugly things).