I add to this that you can simply add the old node address in the new node settings.
No need to restart running nodes.
My 2 cents
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David 
Twitter : @dadoonet / @elasticsearchfr / @scrutmydocs
Le 24 mai 2013 à 19:27, Logan Hardy loganbhardy@gmail.com a écrit :
Dina,
This value should contain a comma separated list of all the nodes in your cluster and each node will need to be restarted in order for it to pick up the new settings. Make sure all the nodes have identical configs. Also make sure you don't have a firewall blocking the Elasticsearch ports.
discovery.zen.ping.unicast.hosts: ["node1", "node2", "node3", "node4"]
p.s. specifying the port is not necessary if you are using the default ports.
On Friday, May 24, 2013 12:31:27 AM UTC-7, dina abu khader wrote:
Hello ,
I am new to ES , we already setup a node on a machine and starting importing data into it, now I want to add another node to this cluster
by modifying this configuration on the existing node
discovery.zen.ping.unicast.hosts: ["xx.xx.xx.xx:9300"]
I am getting the following error
failed to send join request to master , reason [org.elsticsearch.ElasticSearchTimeoutException: Timeout waiting for task.]
Regards
Dina
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