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    via GitHub by dakrone

    Elasticsearch 1.x and 2.x nodes are not compatible, make sure your setup contains nodes of the same major version.

java.lang.NullPointerException: null at org.elasticsearch.transport.netty.MessageChannelHandler.handleException(MessageChannelHandler.java:179)[elasticsearch-2.4.4.jar:2.4.4] at org.elasticsearch.transport.netty.MessageChannelHandler.handlerResponseError(MessageChannelHandler.java:174)[elasticsearch-2.4.4.jar:2.4.4] at org.elasticsearch.transport.netty.MessageChannelHandler.messageReceived(MessageChannelHandler.java:122)[elasticsearch-2.4.4.jar:2.4.4] at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)[netty-3.10.6.Final.jar:na] at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)[netty-3.10.6.Final.jar:na] at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)[netty-3.10.6.Final.jar:na] at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:296)[netty-3.10.6.Final.jar:na] at org.jboss.netty.handler.codec.frame.FrameDecoder.unfoldAndFireMessageReceived(FrameDecoder.java:462)[netty-3.10.6.Final.jar:na] at org.jboss.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:443)[netty-3.10.6.Final.jar:na] at org.jboss.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:303)[netty-3.10.6.Final.jar:na] at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)[netty-3.10.6.Final.jar:na] at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)[netty-3.10.6.Final.jar:na] at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559)[netty-3.10.6.Final.jar:na] at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)[netty-3.10.6.Final.jar:na] at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)[netty-3.10.6.Final.jar:na] at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88)[netty-3.10.6.Final.jar:na] at org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:108)[netty-3.10.6.Final.jar:na] at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:337)[netty-3.10.6.Final.jar:na] at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:89)[netty-3.10.6.Final.jar:na] at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)[netty-3.10.6.Final.jar:na] at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)[netty-3.10.6.Final.jar:na] at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)[netty-3.10.6.Final.jar:na] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[na:1.8.0_112] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[na:1.8.0_112] at java.lang.Thread.run(Thread.java:745)[na:1.8.0_112]