Logstash remove N/A field

Elastic Stack Logstash
1

I am trying to remove all the fields which have N/A next to the them like "toto: N/A", I am currently removing them with a enormous IF forest which I have hard coded but I would like a better alternative, to an enormous amount of if's, let's say I have this:

toto1: N/A
test1 {
toto2: true
toto3: N/A
}

I want to transform it into :

test1 {
toto2: true
}

Can I do this with anything other then a Ruby filter? If not, how do I do it with Ruby?

2

You could try

    ruby {
        init => '
            def doSomething(object, name, event)
                #puts "doSomething called for #{name}"
                if object
                    if object.kind_of?(Hash) and object != {}
                        object.each { |k, v| doSomething(v, "#{name}[#{k}]", event) }
                    elsif object.kind_of?(Array) and object != []
                        object.each_index { |i|
                            doSomething(object[i], "#{name}[#{i}]", event)
                        }
                    else
                        if object == "N/A"
                            event.remove(name)
                        end
                    end
                end
            end
        '
        code => '
            event.to_hash.each { |k, v|
                doSomething(v, "[#{k}]", event)
            }
        '
    }

That modifies the event whilst iterating over it. I don't know enough about ruby function calls to know whether that has the possibility of blowing up.