.cluster()
                    .prepareNodesHotThreads()
                    .setIgnoreIdleThreads(ignoreIdleThreads)
                    .setInterval(interval)
                    .setThreads(threads)
                    .setTimeout(timeout)
                    .setType(type)
                    .execute()
                    .actionGet(timeout);

            return b.toString();
        }).collect(Collectors.joining(",")));
        buf.append("},");
        final Threads threads = jvmStats.getThreads();
        buf.append("\"threads\":{");
        append(buf, "count", () -> threads.getCount()).append(',');
        append(buf, "peak", () -> threads.getPeakCount());
        buf.append("},");