@Override
        public void run() {
            try {
                super.run();
            } catch (Exception e) {
                log.log(Level.SEVERE, String.format("Error while sending logger entry: %s", e), e);
            }
        }
Synchronously shuts down and waits for enqueued entries to be sent.
container-search/src/main/java/com/yahoo/search/logging/AbstractThreadedLogger.java