That explains meaning of
elasticsearch_discovery_zen_ping_unicast_hosts: the hosts of ES cluster - 
in my case it is 3 ES nodes

but what is the meaning of
graylog_elasticsearch_discovery_zen_ping_unicast_hosts? How to set it?

 
https://github.com/Graylog2/graylog2-server/blob/2.1.1/misc/graylog.conf#L271-L274
 
<https://www.google.com/url?q=https%3A%2F%2Fgithub.com%2FGraylog2%2Fgraylog2-server%2Fblob%2F2.1.1%2Fmisc%2Fgraylog.conf%23L271-L274&sa=D&sntz=1&usg=AFQjCNGAa9QlpJDUMhoS0_vmPrc7NdBr0g>
 
does not have it explained.
My guess is that this parameter setting affects configuration of GL servers 
(in my case 2 GL servers) but how?
I also guess that improper setting of this patameter leads to having master 
issue - in my case each of my two GL servers acts as a master
and it is reported in GL cluster GUI.

Thanks,
Evgueni

On Friday, October 7, 2016 at 11:39:19 AM UTC-7, Evgueni Gordienko wrote:
>
> Hi,
>
> I have GL(2 nodes) + ES(3 nodes) cluster.
> What is the meaning of 
> graylog_elasticsearch_discovery_zen_ping_unicast_hosts setting?
>
> Thanks,
> Evgueni 
>

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