The ARN of an S3 bucket and the path prefix for S3 logs. If your Amazon S3 bucket name is my-bucket, and your path prefix is build-log, then acceptable formats are my-bucket/build-log or arn:aws:s3:::my-bucket/build-log.
my-bucket
build-log
my-bucket/build-log
arn:aws:s3:::my-bucket/build-log