@Target(value=TYPE)
@Retention(value=RUNTIME)
public @interface HandleUnknownAttributes
If this annotation is added to a class with @DoNotEncrypt, then the unknown attributes will only be included in the signature calculation, and if it's added to a class with default encryption behavior, the unknown attributes will be signed and decrypted.
For guidance on performing a safe data model change procedure, please see DynamoDB Encryption Client Developer Guide: Changing your data model