[o.e.x.s.t.n.securityNetty4ServerTransport] Send message failed NettyTcpchannel

I am getting below warning in my Elasticsearch cluster logs.

[Warn] [o.e.x.s.t.n.securityNetty4ServerTransport]   Send message failed send message failed [Channel: NettyTcpchannel{localAddress=0.0.0/0.0.0.0:9300}, remote address=IP:port]]  java.nio.channels.ClosedChannelException:null

Can someone please guide me what is root cause of this.