using readonlyrest 1.16.18 and elasticsearch 2.4.6, we are getting 401 errors on calls to modify aliases. The users permissions are just a simple allow all. Here’s a trace:
[2018-04-13 19:20:00,256][ERROR][rest.action.support      ] failed to send failure response
java.lang.IllegalStateException: Channel is already closed
    at org.elasticsearch.http.HttpServer$ResourceHandlingHttpChannel.close(HttpServer.java:358)
    at org.elasticsearch.http.HttpServer$ResourceHandlingHttpChannel.sendResponse(HttpServer.java:351)
    at org.elasticsearch.rest.action.support.RestActionListener.onFailure(RestActionListener.java:60)
    at org.elasticsearch.action.support.TransportAction$1.onFailure(TransportAction.java:95)
    at tech.beshu.ror.es.IndexLevelActionFilter$1.onErrored(IndexLevelActionFilter.java:247)
    at tech.beshu.ror.acl.ACL.lambda$check$3(ACL.java:211)
    at java.util.concurrent.CompletableFuture.uniExceptionally(CompletableFuture.java:870)
    at java.util.concurrent.CompletableFuture.uniExceptionallyStage(CompletableFuture.java:884)
    at java.util.concurrent.CompletableFuture.exceptionally(CompletableFuture.java:2196)
    at tech.beshu.ror.acl.ACL.check(ACL.java:210)
    at tech.beshu.ror.es.IndexLevelActionFilter.handleRequest(IndexLevelActionFilter.java:201)
    at tech.beshu.ror.es.IndexLevelActionFilter.lambda$apply$6(IndexLevelActionFilter.java:173)
    at java.security.AccessController.doPrivileged(Native Method)
    at tech.beshu.ror.es.IndexLevelActionFilter.apply(IndexLevelActionFilter.java:169)
    at org.elasticsearch.action.support.TransportAction$RequestFilterChain.proceed(TransportAction.java:170)
    at org.elasticsearch.action.support.TransportAction.execute(TransportAction.java:144)
    at org.elasticsearch.action.support.TransportAction.execute(TransportAction.java:85)
    at org.elasticsearch.client.node.NodeClient.doExecute(NodeClient.java:58)
    at org.elasticsearch.client.support.AbstractClient.execute(AbstractClient.java:359)
    at org.elasticsearch.client.FilterClient.doExecute(FilterClient.java:52)
    at org.elasticsearch.rest.BaseRestHandler$HeadersAndContextCopyClient.doExecute(BaseRestHandler.java:88)
    at org.elasticsearch.client.support.AbstractClient.execute(AbstractClient.java:359)
    at org.elasticsearch.client.support.AbstractClient$IndicesAdmin.execute(AbstractClient.java:1226)
    at org.elasticsearch.client.support.AbstractClient$IndicesAdmin.aliases(AbstractClient.java:1276)
    at org.elasticsearch.rest.action.admin.indices.alias.RestIndicesAliasesAction.handleRequest(RestIndicesAliasesAction.java:152)
    at org.elasticsearch.rest.BaseRestHandler.handleRequest(BaseRestHandler.java:54)
    at org.elasticsearch.rest.RestController.executeHandler(RestController.java:198)
    at org.elasticsearch.rest.RestController$RestHandlerFilter.process(RestController.java:280)
    at org.elasticsearch.rest.RestController$ControllerFilterChain.continueProcessing(RestController.java:261)
    at tech.beshu.ror.es.ReadonlyRestPlugin$RestLogger$1.process(ReadonlyRestPlugin.java:91)
    at org.elasticsearch.rest.RestController$ControllerFilterChain.continueProcessing(RestController.java:264)
    at org.elasticsearch.rest.RestController.dispatchRequest(RestController.java:161)
    at org.elasticsearch.http.HttpServer.internalDispatchRequest(HttpServer.java:153)
    at org.elasticsearch.http.HttpServer$Dispatcher.dispatchRequest(HttpServer.java:101)
    at org.elasticsearch.http.netty.NettyHttpServerTransport.dispatchRequest(NettyHttpServerTransport.java:451)
    at org.elasticsearch.http.netty.HttpRequestHandler.messageReceived(HttpRequestHandler.java:61)
    at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
    at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
    at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
    at org.elasticsearch.http.netty.pipelining.HttpPipeliningHandler.messageReceived(HttpPipeliningHandler.java:60)
    at org.jboss.netty.channel.SimpleChannelHandler.handleUpstream(SimpleChannelHandler.java:88)
    at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
    at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
    at org.jboss.netty.channel.SimpleChannelUpstreamHandler.messageReceived(SimpleChannelUpstreamHandler.java:124)
    at org.elasticsearch.http.netty.cors.CorsHandler.messageReceived(CorsHandler.java:87)
    at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
    at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
    at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
    at org.jboss.netty.handler.codec.http.HttpContentEncoder.messageReceived(HttpContentEncoder.java:82)
    at org.jboss.netty.channel.SimpleChannelHandler.handleUpstream(SimpleChannelHandler.java:88)
    at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
    at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
    at org.jboss.netty.handler.codec.http.HttpChunkAggregator.messageReceived(HttpChunkAggregator.java:145)
    at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
    at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
    at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
    at org.jboss.netty.handler.codec.http.HttpContentDecoder.messageReceived(HttpContentDecoder.java:108)
    at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
    at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
    at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
    at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:296)
    at org.jboss.netty.handler.codec.frame.FrameDecoder.unfoldAndFireMessageReceived(FrameDecoder.java:459)
    at org.jboss.netty.handler.codec.replay.ReplayingDecoder.callDecode(ReplayingDecoder.java:536)
    at org.jboss.netty.handler.codec.replay.ReplayingDecoder.messageReceived(ReplayingDecoder.java:435)
    at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
    at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
    at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
    at org.elasticsearch.common.netty.OpenChannelsHandler.handleUpstream(OpenChannelsHandler.java:75)
    at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
    at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559)
    at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)
    at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)
    at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88)
    at org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:108)
    at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:337)
    at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:89)
    at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
    at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
    at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:748)