code: public TaskExecutorBuilder additionalCustomizers(
  			TaskExecutorCustomizer... customizers) {
  		Assert.notNull(customizers, "Customizers must not be null");
  		return additionalCustomizers(Arrays.asList(customizers));
  	}
docs: Add {@link TaskExecutorCustomizer TaskExecutorCustomizers} that should be applied
  to the {@link ThreadPoolTaskExecutor}. Customizers are applied in the order that
  they were added after builder configuration has been applied.
  @param customizers the customizers to add
  @return a new builder instance
  @see #customizers(TaskExecutorCustomizer...)