code: @ReadOperation
  	public Health healthForComponent(@Selector String component) {
  		HealthIndicator indicator = getNestedHealthIndicator(this.healthIndicator,
  				component);
  		return (indicator != null) ? indicator.health() : null;
  	}
docs: Return the {@link Health} of a particular component or {@code null} if such
  component does not exist.
  @param component the name of a particular {@link HealthIndicator}
  @return the {@link Health} for the component or {@code null}