@Bean Annotation on Collection<RequetInterceptor> Not working

From looking at the documentation on customizing FeignClients, I am experiencing that the following code is not working to create a list of RequestInterceptors...I have to create individual RequestInterceptrs instead and annotate with "@Bean"

	 @Bean
	 public RequestInterceptor xAuthTokenForwardingRequestInterceptor(){
		log.info("Configuring instance [{}]", RequestInterceptor.class);
		return new HystrixHeaderForwardingRequestInterceptor( "X-Auth-Token");
	 }

	 @Bean
	 public RequestInterceptor xAuthUserTokenForwardingRequestInterceptor(){
		log.info("Configuring instance [{}]", RequestInterceptor.class);
		return new HystrixHeaderForwardingRequestInterceptor( "X-Auth-User-Token");
	 }

//   This does not work despite the Spring Cloud/Netflix documentation saying it should work	 
//	 @Bean
//	 public Collection<RequestInterceptor> headerForwardingRequestInterceptors(){
//		log.info("Configuring instance [{}]", RequestInterceptor.class);
//		
//		List<RequestInterceptor> interceptors = new ArrayList<>();
//		
//		this.properties.getForwardedHeaders().forEach(fh->{
//			interceptors.add(new HystrixHeaderForwardingRequestInterceptor( fh));
//		});
//		
//		log.info("headerForwardingRequestInterceptors - configured interceptor:[{}]", interceptors);
//		return interceptors;
//	 }

Start with the Feign client customization documentation referenced in the report and reproduce the supplied @Bean configurations, comparing separate RequestInterceptor beans with the Collection bean. Trace the existing RequestInterceptor bean-discovery entry point; done when the reported collection behavior is explained and covered by a regression test or the documentation is corrected.