private void sendPrivileged(String key, byte[] value, Timer timer) throws ExecutionException, InterruptedException, TimeoutException {
        sendPrivileged(Collections.singletonList(new ProducerKeyValue(key, value)), timer);
    }
Send a single record to the config topic synchronously. Note that {@link #claimWritePrivileges()} must be
successfully invoked before calling this method if this store is configured to use a fencable writer.
@param key the record key
@param value the record value
@param timer Timer bounding how long this method can block. The timer is updated before the method returns.
connect/runtime/src/main/java/org/apache/kafka/connect/storage/KafkaConfigBackingStore.java