This field defines the machine(s) and/or network(s) that constitute a
cluster of Search Appliances. You can specify multiple addresses with a
network prefix and wildcard (like 10.10.10.*),
netmask (like 10.10.1.0:255.255.255.0) , or address/prefixlen (like 10.10.1.0/24) format.
All machines matching these IPs will be allowed full access to the Search Appliance
internals without verification. This allows for replication and dataload.
If the request is forwarded such that a X-Forwarded-For header is
included (like a load balancer), all IPs through the forwarding chain must be
allowed by Cluster Members.
