Logstash: replace kv with ruby (save fields as string, int or float)

gistfile1.txt

    ruby {
      code =>
      "
        fieldArray = event['lb_message'].split(' ');
        for field in fieldArray
          name = 'prefix_' + field.split('=')[0];
          value = field.split('=')[1];
          if value =~ /\A\d+\Z/
              event[name] = value.to_i
          elsif value =~ /(^(\d+)(\.)?(\d+)?)|(^(\d+)?(\.)(\d+))/
              event[name] = value.to_f
          else
            	new_value = value.to_s.gsub /\"/, ''
              event[name] = new_value
          end
        end
      "
    }