In my elasticsearch.log i have this error when start.[WARN ][discovery.zen.ping.multicast] [Wolf] failed to send multicast ping request: IOException[Operation not permitted]
I'm using Centos 6 on EC2 + jdk1.8.0_60 + elasticsearch version 1.7.1
Sounds like your OS or Network does not allow multicast.
Whatever, it is a bad practice for production and you should use unicast.
It will be the default in 2.0 and multicast will be a plugin.
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