Elasticsearch log output when nodes are running different JVM versions

elasticsearch.log

[2013-04-24 00:59:53,539][WARN ][action.index             ] [hostname] Failed to perform index on replica [logstash-2013.04.24][3] 
org.elasticsearch.transport.RemoteTransportException: Failed to deserialize exception response from stream
Caused by: org.elasticsearch.transport.TransportSerializationException: Failed to deserialize exception response from stream
        at org.elasticsearch.transport.netty.MessageChannelHandler.handlerResponseError(MessageChannelHandler.java:171)
        at org.elasticsearch.transport.netty.MessageChannelHandler.messageReceived(MessageChannelHandler.java:125)
        at org.elasticsearch.common.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
        at org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:560)
        at org.elasticsearch.common.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:787)
        at org.elasticsearch.common.netty.channel.Channels.fireMessageReceived(Channels.java:296)
        at org.elasticsearch.common.netty.handler.codec.frame.FrameDecoder.unfoldAndFireMessageReceived(FrameDecoder.java:462)
        at org.elasticsearch.common.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:443)
        at org.elasticsearch.common.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:303)
        at org.elasticsearch.common.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
        at org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:560)
        at org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:555)
        at org.elasticsearch.common.netty.channel.Channels.fireMessageReceived(Channels.java:268)
        at org.elasticsearch.common.netty.channel.Channels.fireMessageReceived(Channels.java:255)
        at org.elasticsearch.common.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88)
        at org.elasticsearch.common.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:107)
        at org.elasticsearch.common.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:313)
        at org.elasticsearch.common.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:88)
        at org.elasticsearch.common.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
        at org.elasticsearch.common.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
        at org.elasticsearch.common.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:722)
Caused by: java.io.StreamCorruptedException: unexpected end of block data
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1369)
        at java.io.ObjectInputStream.access$300(ObjectInputStream.java:205)
        at java.io.ObjectInputStream$GetFieldImpl.readFields(ObjectInputStream.java:2132)
        at java.io.ObjectInputStream.readFields(ObjectInputStream.java:537)
        at java.net.InetSocketAddress.readObject(InetSocketAddress.java:282)
        at sun.reflect.GeneratedMethodAccessor38.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1004)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1872)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1777)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1970)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1894)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1777)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1970)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1894)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1777)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369)
        at org.elasticsearch.transport.netty.MessageChannelHandler.handlerResponseError(MessageChannelHandler.java:169)
        ... 23 more
[2013-04-24 00:59:53,544][WARN ][cluster.action.shard     ] [hostname] sending failed shard for [logstash-2013.04.24][3], node[obkgtvEVS3q59PlJWfY03g], [R], s[INITIALIZING], reason [Failed to perform [index] on replica, message [RemoteTransportException[Failed to deserialize exception response from stream]; nested: TransportSerializationException[Failed to deserialize exception response from stream]; nested: StreamCorruptedException[unexpected end of block data]; ]]
[2013-04-24 00:59:53,544][WARN ][transport.netty          ] [hostname] Message not fully read (response) for [4541427] handler org.elasticsearch.action.support.replication.TransportShardReplicationOperationAction$AsyncShardOperationAction$4@7a8295ea, error [true], resetting