@Bean
    @Lazy(false)
    public Executor bootstrapExecutor() {
        return Executors.newVirtualThreadPerTaskExecutor();
    }
Bean bootstrap executor.
Enables bean background initialization option: {@code @Bean(bootstrap=BACKGROUND)}
for singling out specific beans for background initialization, covering the entire bean
creation step for each such bean on context startup.
A {@code bootstrapExecutor} bean of type {@link Executor} must be declared for background bootstrapping to
be actually active. Otherwise, the background markers will be ignored at runtime.
@return the executor
core/cas-server-core-util/src/main/java/org/apereo/cas/config/CasCoreUtilConfiguration.java