@Target(value=FIELD) @Retention(value=RUNTIME) @Documented public @interface NestedConfigurationProperty
@ConfigurationPropertiesobject should be treated as if it were a nested type. This annotation has no bearing on the actual binding processes, but it is used by the
spring-boot-configuration-processoras a hint that a field is not bound as a single value. When this is specified, a nested group is created for the field and its type is harvested.
This has no effect on collections and maps as these types are automatically identified.