[RECOVERING]->[CLOSED], reason [ignore recovery: source node disconnected]

Hi, guys:
We have a ES cluster with 20 machines. after the cluster setup(green). I
tried to insert one simple doc. after that, the cluster become to yellew
from green.
From the head plugin, I saw some shards stayed in yellow state for long
time.
I did the log, and found something like:
[test040] [test1][12] state: [RECOVERING]->[CLOSED], reason [ignore
recovery: source node disconnected ([test027][YAam3GRnTBm4X69FnR9vZQ]
[inet[/192.168.1.27:9300]]{master=false})]
And we checked the network, it seems no problem.
Now I don't know how to resolve this problem. Can anyone give me a hand?
Thanks a lot.

-Regards-
-Jackie-

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