@CustomType.Setter
        public Builder gateway(String gateway) {
            if (gateway == null) {
              throw new MissingRequiredPropertyException("ScaleIOPersistentVolumeSource", "gateway");
            }
            this.gateway = gateway;
            return this;
        }
@return volumeName is the name of a volume already created in the ScaleIO system that is associated with this volume source.
sdk/java/src/main/java/com/pulumi/kubernetes/core/v1/outputs/ScaleIOPersistentVolumeSource.java