buf.append('"').append(StringEscapeUtils.escapeJson(format)).append('"');
        } else if (value instanceof String[]) {
            final String json = Arrays.stream((String[]) value)
                    .map(s -> "\"" + StringEscapeUtils.escapeJson(s) + "\"")
                    .collect(Collectors.joining(","));
            buf.append('[').append(json).append(']');

        buf.append(",\"event.dataset\":\"").append(ecsEventDataset).append('"');
        buf.append(",\"process.thread.name\":\"").append(StringEscapeUtils.escapeJson(Thread.currentThread().getName())).append('"');
        buf.append(",\"log.logger\":\"").append(StringEscapeUtils.escapeJson(this.getClass().getName())).append('"');
        valueMap.entrySet()
                .stream()
                .forEach(e -> buf.append(",\"labels.")

        try {
            zos.putNextEntry(entry);
            SearchEngineUtil.scroll(index, hit -> {
                final String data = "{\"index\":{\"_index\":\"" + index + "\",\"_id\":\"" + StringEscapeUtils.escapeJson(hit.getId())
                        + "\"}}\n" + hit.getSourceAsString() + "\n";
                try {
                    zos.write(data.getBytes(Constants.CHARSET_UTF_8));
                } catch (final IOException e) {