I have an empty cluster with 3 nodes. When I try to enable the projections in the UI, it fails with message.
$by_category: null, $by_event_type: null, $stream_by_category: null, $streams: null
I was logged in on the UI of a slave node.
Is it so that enabling projections only works on the master node? By chance I logged in on another which happened to be the master and then it succeeded.