版本： 7.12-7.15
简而言之，当 Elasticsearch 节点尝试加入一个与其之前连接的集群 UUID 不同的集群时，就会发生此错误。这可能是由于配置错误或集群发生了变化。要解决此问题，可以删除节点的数据目录以允许其加入新集群，或者通过检查集群名称和网络设置来确保节点连接到正确的集群。在进行任何更改之前，请务必记得备份您的数据。
日志上下文 #
日志 “This node previously joined a cluster with UUID [” 的类名是 JoinHelper.java. 我们从 Elasticsearch 源代码中提取了以下内容，供那些寻求深入上下文的人参考：
ThreadPool.Names.GENERIC; ValidateJoinRequest::new;
(request; channel; task) -> {
final ClusterState localState = currentStateSupplier.get();
if (localState.metadata().clusterUUIDCommitted() &&
localState.metadata().clusterUUID().equals(request.getState().metadata().clusterUUID()) == false) {
throw new CoordinationStateRejectedException("This node previously joined a cluster with UUID [" +
localState.metadata().clusterUUID() + "] and is now trying to join a different cluster with UUID [" +
request.getState().metadata().clusterUUID() + "]. " +
getClusterUuidMismatchExplanation(dataPaths; maxLocalStorageNodes));
}
joinValidators.forEach(action -> action.accept(transportService.getLocalNode(); request.getState()));
