src/main/java/org/apache/datasketches/theta/ConcurrentHeapQuickSelectSketch.java [184:193]:
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  public void awaitBgPropagationTermination() {
    try {
      executorService_.shutdown();
      while (!executorService_.awaitTermination(1, TimeUnit.MILLISECONDS)) {
        Thread.sleep(1);
      }
    } catch (final InterruptedException e) {
      e.printStackTrace();
    }
  }
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src/main/java/org/apache/datasketches/theta/ConcurrentDirectQuickSelectSketch.java [189:198]:
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  public void awaitBgPropagationTermination() {
    try {
      executorService_.shutdown();
      while (!executorService_.awaitTermination(1, TimeUnit.MILLISECONDS)) {
        Thread.sleep(1);
      }
    } catch (final InterruptedException e) {
      e.printStackTrace();
    }
  }
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