code: public HealthIndicatorRegistry createHealthIndicatorRegistry(
  			Map<String, HealthIndicator> healthIndicators) {
  		Assert.notNull(healthIndicators, "HealthIndicators must not be null");
  		return initialize(new DefaultHealthIndicatorRegistry(), healthIndicators);
  	}
docs: Create a {@link HealthIndicatorRegistry} based on the specified health indicators.
  @param healthIndicators the {@link HealthIndicator} instances mapped by name
  @return a {@link HealthIndicator} that delegates to the specified
  {@code healthIndicators}.