Note: SoftNAS® FlexFiles Architect is a part of our legacy SoftNAS Platinum offering. It will not be visible in versions above 4.4.1 of our SoftNAS product, and is included here for legacy purposes.
Controller Services are shared services that can be used by reporting tasks, processors, and other services to utilize for configuration or task execution.
Note: Controller Services defined on the controller level are limited to reporting tasks and other services defined there. Controller Services for use by processors in your dataflow must be defined in the configuration of the root process group or sub-process group(s) where they will be used.
...
The following documentation from NiFi covers specific use cases for Controller Services: