Add recommendation on unicast hosts to docs
This commit adds a small note to the discovery docs to include a note
that we recommend that the unicast hosts list be maintained as the list
of master-eligible nodes in the cluster.
Relates
@@ -33,6 +33,9 @@ negative hostname resolutions for ten seconds. This can be modified by adding
http://docs.oracle.com/javase/8/docs/technotes/guides/net/properties.html[`networkaddress.cache.negative.ttl=<timeout>`]
to your http://docs.oracle.com/javase/8/docs/technotes/guides/security/PolicyFiles.html[Java security policy].
+It is recommended that the unicast hosts list be maintained as the list of
+master-eligible nodes in the cluster.
+
Unicast discovery provides the following settings with the `discovery.zen.ping.unicast` prefix:
[cols="<,<",options="header",]
