ES rest 查询 timeout的问题

 
使用java rest api，创建restclient实例：
restClient = RestClient.builder(new HttpHost(ip, port, "http")).build();
但是在访问中会出现以下错误日志：

[2018-01-18T07:11:15,134][WARN ][o.e.h.n.Netty4HttpServerTransport] [nodeMaster] caught exception while handling client http traffic, closing connection 
java.io.IOException: 连接超时
at sun.nio.ch.FileDispatcherImpl.read0(Native Method) ~[?:?]
at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39) ~[?:?]
at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223) ~[?:?]
at sun.nio.ch.IOUtil.read(IOUtil.java:197) ~[?:?]
at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:380) ~[?:?]
at io.netty.buffer.PooledHeapByteBuf.setBytes(PooledHeapByteBuf.java:261) ~[netty-buffer-4.1.7.Final.jar:4.1.7.Final]
at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:1100) ~[netty-buffer-4.1.7.Final.jar:4.1.7.Final]
at io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:366) ~[netty-transport-4.1.7.Final.jar:4.1.7.Final]
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:118) [netty-transport-4.1.7.Final.jar:4.1.7.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:642) [netty-transport-4.1.7.Final.jar:4.1.7.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:527) [netty-transport-4.1.7.Final.jar:4.1.7.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:481) [netty-transport-4.1.7.Final.jar:4.1.7.Final]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:441) [netty-transport-4.1.7.Final.jar:4.1.7.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858) [netty-common-4.1.7.Final.jar:4.1.7.Final]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_111]
 
出现连接超时的问题，不太理解，如果是远程主机强迫关闭之类的就可以理解，不明白是为什么