Missing host parents field

In Monitoring it is helpful if you something about the relation of hosts from a monitoring perspective.

In order for monitoring to calculate the UNREACHABLE state, it must know how it can reach each individual host. To do this, you can specify one or more so-called parent hosts for each host. If, for example, server A can only be reached via router B from a monitoring point of view, then B is a parent of A. Only direct parents are configured.
The most important task of the Parents is the detection of network failures and the avoidance of mass false alarms in such situations.

I would suggest to add a host.parents field for that to the elastic common scheme.