nested message field in message field gets lost when overlaying parsed message about fluent-plugin-burrow HOT 4 OPEN

  def filter(tag, time, record)
    raw_value = record[@key_name]
    if raw_value then
      new_time, new_values = nil, nil
      @parser.parse(raw_value) do |parsed_time, parsed_values|
        new_time   = parsed_time
        new_values = parsed_values
      end

      if new_values then
        original_time = record[@record_time_key]
        new_time ||= original_time

        # Remove the key before we merge the new values in case the merger re-creates the key
        if ['overlay','replace','prefix'].include? @action
          if not @keep_key and record.has_key?(@key_name)
            record.delete(@key_name)
          end
        end

        # Overlay new record on top of original record?
        new_record = case @action
        when 'inplace'
          record.merge({@key_name => new_values})
        when 'overlay'
          record.merge(new_values)
        when 'replace'
          new_values
        when 'prefix'
          record.merge({@data_prefix => new_values})
        end

        # Preserve 'time' key?
        if @keep_time
          new_record[@record_time_key] = original_time
        end

        new_record
      end
    end
  end