elasticsearch/elasticsearch — pull request #7950 by bleskes (2014-10-01 15:39:27+00:00)
Title: Discovery: only accept unicast pings when started

Due to component start order we may process an incoming ping while the ZenDiscovery module is not yet started. This leads to exception (from which we recover correctly, but the logs are note nice). UnicastZenPing should only start processing pings if it is started. We previously processed if not closed or stopped.