allowsUnencryptedObjectUploads   
  Specifies whether the bucket policy for the bucket requires server-side encryption of objects when objects are added to the bucket. Possible values are:
- FALSE - The bucket policy requires server-side encryption of new objects. PutObject requests must include a valid server-side encryption header. 
- TRUE - The bucket doesn't have a bucket policy or it has a bucket policy that doesn't require server-side encryption of new objects. If a bucket policy exists, it doesn't require PutObject requests to include a valid server-side encryption header. 
- UNKNOWN - Amazon Macie can't determine whether the bucket policy requires server-side encryption of new objects. 
Valid server-side encryption headers are: x-amz-server-side-encryption with a value of AES256 or aws:kms, and x-amz-server-side-encryption-customer-algorithm with a value of AES256.