Made possible to dynamically update discovery.zen.publish_timeout
cluster setting
#5068
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discovery.zen.publish_timeout
controls how long the master node is going to try and wait for all the nodes to respond to a cluster state publish before going ahead with the following updates in the queue (default 30s). Up until now changing the settings required restarting each node. The setting is now dynamic and can be changed through the cluster update settings api.Closes #5063