@Target(value=FIELD) @Retention(value=RUNTIME) @Documented public @interface NestedConfigurationProperty
@ConfigurationProperties
 object 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-processor as 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.
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