stop a node the error is TransportService is closed stopped can't send request

[whybangbang]

we have to put a plugin to the produce envrionment,but when we stop a node ,the log produce a error :"TransportService is closed stopped can't send request",and when we restart the node,it's a long time even 1 minute util cluster find the node,we don't konw how to do
we use aws plugin elasticsearch 1.5.2
discovery.type: "ec2"
discovery.ec2.host_type: "private_ip"
discovery.ec2.ping_timeout: "30s"

if discovery.ec2.ping_timeout is short ,cluster can't build