» [2022-03-10T15:01:58,728][WARN ][o.e.t.RemoteClusterConnection] [v7.5.0-0] fetching nodes from external cluster [foo] failed
»  org.elasticsearch.transport.ConnectTransportException: [][127.0.0.1:9200] connect_exception
»  	at org.elasticsearch.transport.TcpTransport$ChannelsConnectedListener.onFailure(TcpTransport.java:989) ~[elasticsearch-7.5.0.jar:7.5.0]
»  	at org.elasticsearch.action.ActionListener.lambda$toBiConsumer$3(ActionListener.java:162) ~[elasticsearch-7.5.0.jar:7.5.0]
...
org.elasticsearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor$TieBreakingPrioritizedRunnable.run(PrioritizedEsThreadPoolExecutor.java:223) ~[elasticsearch-8.1.1-SNAPSHOT.jar:8.1.1-SNAPSHOT]
»  	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) [?:?]
»  	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) [?:?]
»  	at java.lang.Thread.run(Thread.java:833) [?:?]
»  Caused by: io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: 127.0.0.1/127.0.0.1:45187
»  Caused by: java.net.ConnectException: Connection refused
»  	at sun.nio.ch.Net.pollConnect(Native Method) ~[?:?]
»  	at sun.nio.ch.Net.pollConnectNow(Net.java:672) ~[?:?]
»  	at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:946) ~[?:?]
»  	at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:330) ~[?:?]
»  	at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:334) ~[?:?]
»  	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:710) ~[?:?]
»  	at io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:623) ~[?:?]
»  	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:586) ~[?:?]
»  	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:496) ~[?:?]
»  	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986) ~[?:?]
»  	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[?:?]
»  	... 1 more