Exception thrown when starting Elastic search with X-pack - elasticsearch

Question

I have elasticsearch 5.2.0 with x-pack. I am in OS X Sierra and I downloaded the binaries from the official website
An exception shows up everytime I try to start elasticsearch. The Warning shown is the following:
[2017-02-25T11:30:06,354][WARN ][o.e.d.z.UnicastZenPing ] [k9ErfRE] [1] failed send ping to {#zen_unicast_127.0.0.1_0#}{Xruys5FnTRaRKgOnhThjEg}{127.0.0.1}{127.0.0.1:9300}
java.lang.IllegalStateException: handshake failed with {#zen_unicast_127.0.0.1_0#}{Xruys5FnTRaRKgOnhThjEg}{127.0.0.1}{127.0.0.1:9300}
at org.elasticsearch.transport.TransportService.handshake(TransportService.java:364) ~[elasticsearch-5.2.0.jar:5.2.0]
at org.elasticsearch.discovery.zen.UnicastZenPing$PingingRound.getOrConnect(UnicastZenPing.java:393) ~[elasticsearch-5.2.0.jar:5.2.0]
at org.elasticsearch.discovery.zen.UnicastZenPing$3.doRun(UnicastZenPing.java:500) [elasticsearch-5.2.0.jar:5.2.0]
at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:596) [elasticsearch-5.2.0.jar:5.2.0]
at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) [elasticsearch-5.2.0.jar:5.2.0]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_112]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_112]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_112]
Caused by: org.elasticsearch.transport.RemoteTransportException: [Dc1gCWm][127.0.0.1:9300][internal:transport/handshake]
Caused by: org.elasticsearch.ElasticsearchSecurityException: missing authentication token for action [internal:transport/handshake]
at org.elasticsearch.xpack.security.support.Exceptions.authenticationError(Exceptions.java:39) ~[?:?]
at org.elasticsearch.xpack.security.authc.DefaultAuthenticationFailureHandler.missingToken(DefaultAuthenticationFailureHandler.java:74) ~[?:?]
at org.elasticsearch.xpack.security.authc.AuthenticationService$AuditableTransportRequest.anonymousAccessDenied(AuthenticationService.java:483) ~[?:?]
at org.elasticsearch.xpack.security.authc.AuthenticationService$Authenticator.lambda$handleNullToken$13(AuthenticationService.java:315) ~[?:?]
at org.elasticsearch.xpack.security.authc.AuthenticationService$Authenticator.handleNullToken(AuthenticationService.java:320) ~[?:?]
at org.elasticsearch.xpack.security.authc.AuthenticationService$Authenticator.consumeToken(AuthenticationService.java:247) ~[?:?]
at org.elasticsearch.xpack.security.authc.AuthenticationService$Authenticator.lambda$extractToken$5(AuthenticationService.java:223) ~[?:?]
at org.elasticsearch.xpack.security.authc.AuthenticationService$Authenticator.extractToken(AuthenticationService.java:236) ~[?:?]
at org.elasticsearch.xpack.security.authc.AuthenticationService$Authenticator.lambda$authenticateAsync$0(AuthenticationService.java:184) ~[?:?]
at org.elasticsearch.xpack.security.authc.AuthenticationService$Authenticator.lambda$lookForExistingAuthentication$2(AuthenticationService.java:201) ~[?:?]
at org.elasticsearch.xpack.security.authc.AuthenticationService$Authenticator.lookForExistingAuthentication(AuthenticationService.java:213) ~[?:?]
at org.elasticsearch.xpack.security.authc.AuthenticationService$Authenticator.authenticateAsync(AuthenticationService.java:180) ~[?:?]
at org.elasticsearch.xpack.security.authc.AuthenticationService$Authenticator.access$000(AuthenticationService.java:142) ~[?:?]
at org.elasticsearch.xpack.security.authc.AuthenticationService.authenticate(AuthenticationService.java:114) ~[?:?]
at org.elasticsearch.xpack.security.transport.ServerTransportFilter$NodeProfile.inbound(ServerTransportFilter.java:142) ~[?:?]
at org.elasticsearch.xpack.security.transport.SecurityServerTransportInterceptor$ProfileSecuredRequestHandler.messageReceived(SecurityServerTransportInterceptor.java:296) ~[?:?]
at org.elasticsearch.transport.RequestHandlerRegistry.processMessageReceived(RequestHandlerRegistry.java:69) ~[elasticsearch-5.2.0.jar:5.2.0]
at org.elasticsearch.transport.TcpTransport$RequestHandler.doRun(TcpTransport.java:1488) ~[elasticsearch-5.2.0.jar:5.2.0]
at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-5.2.0.jar:5.2.0]
at org.elasticsearch.common.util.concurrent.EsExecutors$1.execute(EsExecutors.java:109) ~[elasticsearch-5.2.0.jar:5.2.0]
at org.elasticsearch.transport.TcpTransport.handleRequest(TcpTransport.java:1445) ~[elasticsearch-5.2.0.jar:5.2.0]
at org.elasticsearch.transport.TcpTransport.messageReceived(TcpTransport.java:1329) ~[elasticsearch-5.2.0.jar:5.2.0]
at org.elasticsearch.transport.netty4.Netty4MessageChannelHandler.channelRead(Netty4MessageChannelHandler.java:74) ~[?:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363) ~[?:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:349) ~[?:?]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:341) ~[?:?]
at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:293) ~[?:?]
at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:280) ~[?:?]
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:396) ~[?:?]
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:248) ~[?:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363) ~[?:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:349) ~[?:?]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:341) ~[?:?]
at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86) ~[?:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363) ~[?:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:349) ~[?:?]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:341) ~[?:?]
at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1334) ~[?:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363) ~[?:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:349) ~[?:?]
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:926) ~[?:?]
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:129) ~[?:?]
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:642) ~[?:?]
at io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:527) ~[?:?]
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:481) ~[?:?]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:441) ~[?:?]
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858) ~[?:?]
Do you know what is it and why does it appear and how to make it stop?
N.B.: Elasticsearch correctly start after this warning, and everything seems to work fine (for example in querying it or adding indexes and elements to them), but it bothers me that warning and I am afraid that it is a sign for something worse.
Thank you in advance

Answer 1

Looks like an issue with Zen Discovery. Maybe you should increase the ping timeout. More info here:
https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-discovery-zen.html

Answer 2

You must read the latest documentation from https://www.elastic.co/guide/en/x-pack/current/installing-xpack.html#installing-xpack
To use X-Pack you need:
Elasticsearch 5.3.0 - Installing Elasticsearch
Kibana 5.3.0 - Getting Kibana Up and Running
after all installed on u're machine
let's surf this documentation: https://www.elastic.co/guide/en/x-pack/current/security-getting-started.html