secondLine.put("kinds", Arrays.toString(item.getKinds()));
        secondLine.put("@timestamp", item.getTimestamp());

        try (OutputStream out1 = getXContentOutputStream(firstLineMap); OutputStream out2 = getXContentOutputStream(secondLine)) {
            return ((ByteArrayOutputStream) out1).toString(CoreLibConstants.UTF_8) + '\n'
                    + ((ByteArrayOutputStream) out2).toString(CoreLibConstants.UTF_8);