How to re-name multiple field names at once in logstash

Hie All,
I want to rename fields names from this : "[url][path]" => to "url path" and "[server][domain]" => "Server domain"
We can use mutate filter plugin (as mutate uses lot of cpu) ,but I have nearly 50 fields names to be renames is their any other alternative to achieve this ?

mutate {
rename [ "[url][path]" => "url path",
"[server][domain]" => "Server domain"]


You could do that in a ruby filter

    ruby {
        code => '
            event.to_hash.each { |k1, v1|
                if v1.is_a? Hash
                    v1.each { |k2, v2|
                        event.set("#{k1} #{k2}", v2)
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