The custom REST API is removed in favor of a S3 compatible interface.
You can use any AWS S3 compatible tool, or just invoke the REST calls.
Note: REST interface implementation is moved to a separated (stateless) service: s3 gateway. You need to start `ozone s3g` and you can use it.
For example:
aws s3api --endpoint http://localhost:9878 create-bucket --bucket=bucket1