Following points should be added to documentation:
- when configuring cluster for split horizon, IP addresses should not be used instead of host names
- configuration when IP address is used for a host name will be rejected
- it is possible to override such behavior using disableSplitHorizonIPCheck=true parameter
- if cluster configuration is found to have an IP address in split horizon during cluster startup, the error would not prevent node from starting. This is done for scenarios when a node that is already configured was recently upgraded. Configuration changes happening after startup will still be rejected