Yosemite Server: Spotlight from client

I just bought a Mac mini to use as our office server (Yosemite). How can I **search the shared folders with Spotlight from my client** iMac? I tried to connect via SMB and AFP (Go > Connect to Server > afp://192.168.178.44). I tried to use Mavericks (my iMac) and my MacBook Air with 10.10 installed. When I use Spotlight on the server itself, Spotlight will find my test file. The files I am searching for are on a new partition (/Volumes/HD2/dir/sharedfolder/). I even have added Spotlight as user user and group to my shared folder (Icon with one person and two persons on it). mdutil -s /Volumes/* (from a client terminal) says /Volumes/team: Server search enabled. Hope for some help :-) I bought an OSX server because just of Spotlight. Before we used a NAS and needed a better search.