I installed the KFF and Elastic search on a different machine than the one FTK resides on but I can't get FTK to point to it.
Only the Lab and Enterprise versions of FTK support an external KFF server. Standard FTK must have the KFF (Elastic Search) installed on the same machine.
It can be confusing as to why the KFF options in FTK are greyed out when you want to connect to an external server. External servers are only supported by Lab and Enterprise versions of FTK.