Hello everyone!
We have a 3 node (1 master only and 2 data nodes) cluster and we are getting the below error intermittently.
The elastic search service fails on the node and after restarting the service, I got the same stack trace again but after a couple of minutes the node gets stable and reallocation starts.
Elastic search version is 6.2.3. Please let me know if you need any more details.
2020-01-03T23:31:43,334][ERROR][o.e.t.n.Netty4Utils ] fatal error on the network layer
at [org.elasticsearch.transport.netty4.Netty4Utils.maybeDie(Netty4Utils.java:184](http://org.elasticsearch.transport.netty4.Netty4Utils.maybeDie(Netty4Utils.java:184))
at [org.elasticsearch.transport.netty4.Netty4MessageChannelHandler.exceptionCaught(Netty4MessageChannelHandler.java:73](http://org.elasticsearch.transport.netty4.Netty4MessageChannelHandler.exceptionCaught(Netty4MessageChannelHandler.java:73))
..
..
.. 1. [2020-01-03T23:31:43,343][WARN ][o.e.t.n.Netty4Transport ] [zdKm3J4] exception caught on transport layer [NettyTcpChannel{localAddress=/172.20.8.20:9300, remoteAddress=/172.20.8.44:45354}], closing connection
- org.elasticsearch.ElasticsearchException: java.lang.AssertionError: java.text.ParseException: Failed to parse major version from "" (got: )
There doesn't seem to be a network issue during this time.
Complete logs here.