public static ScheduledExecutorService newScheduler(int numThreads, boolean isDaemon) {
    return newScheduler(numThreads, "ambry-scheduler-", isDaemon);
  }
Create a {@link ScheduledExecutorService} with the given properties.
@param numThreads The number of threads in the scheduler's thread pool.
@param isDaemon {@code true} if the threads in this scheduler's should be daemon threads.
@return A {@link ScheduledExecutorService}.
ambry-utils/src/main/java/com/github/ambry/utils/Utils.java