code: public Acl updateDefaultBucketAcl(String bucketName) {
      // [START updateDefaultBucketAcl]
      Acl acl =
          storage.updateDefaultAcl(bucketName, Acl.of(User.ofAllAuthenticatedUsers(), Role.OWNER));
      // [END updateDefaultBucketAcl]
      return acl;
    }
docs: [VARIABLE "my_unique_bucket"]