public String getOldKmsKeyId() {
        return this.oldKmsKeyId;
    }
<p>
The previous KMS key ID the domain was encrypted with, before ServerSideEncryptionConfiguration was updated to a
new KMS key ID.
</p>

@return The previous KMS key ID the domain was encrypted with, before ServerSideEncryptionConfiguration was
        updated to a new KMS key ID.
aws-java-sdk-voiceid/src/main/java/com/amazonaws/services/voiceid/model/ServerSideEncryptionUpdateDetails.java