Projection settings on cluster

Hi there,
I started a cluster with all system projections running then I stopped the $by_correlation_id. After that somehow one of the node restarted itself. And now the projection $by_correlation_id is in invalid state. I cannot start/stop it. Could anyone tell me what’s wrong with this?

Weird, as it sounds, but killing the leader and restarting it may help to resolve interim issues with the wrong projection state.

You can also try abort projection (https://developers.eventstore.com/clients/http-api/v5/api/#abort-projection) and enable it again (https://developers.eventstore.com/clients/http-api/v5/api/#enable-projection).