Elasticsearch节点角色切换，从data节点转变为master报错

由于在刚搭建es集群的时候，资源不足，所以master节点和data节点是没有拆分开的。经常造成master节点的load非常高，现在由于资源充足了，所以开始对节点角色进行改造。

1. 首先把节点上面的数据驱逐到别的节点上面，这个用 es-api 即可

   PUT _cluster/settings
   {
    "transient" : {
    "cluster.routing.allocation.exclude._ip" : "172.18.1.1,172.18.1.2,172.18.1.3"
    }
   }
   

2. 然后修改 elastisearch.yml 的配置文件

   node.master: true
   node.data: false
   node.ingest: true
   search.remote.connect: false
   

3. 还原对集群的设置，虽然这不影响，但是最好还是还原一下

   PUT _cluster/settings
   {
    "transient" : {
    "cluster.routing.allocation.exclude._ip" : ""
    }
   }
   

在重启的过程中，遇到以下报错：

[2020-07-10T19:16:49,211][ERROR][o.e.b.Bootstrap          ] [node-141.56] Exception
java.lang.IllegalStateException: Node is started with node.data=false, but has shard data: [/tol/es-data/es742-prome/nodes/0/indices/wxAOP9NpRYiJ2SXujvEUBg/4, /tol/es-data/es742-prome/nodes/0/indices/88BeYJAnROKWDFJsk42ffg/5]. Use 'elasticsearch-node repurpose' tool to clean up
	at org.elasticsearch.env.NodeEnvironment.ensureNoShardData(NodeEnvironment.java:1081) ~[elasticsearch-7.4.2.jar:7.4.2]
	at org.elasticsearch.env.NodeEnvironment.<init>(NodeEnvironment.java:325) ~[elasticsearch-7.4.2.jar:7.4.2]
	at org.elasticsearch.node.Node.<init>(Node.java:275) ~[elasticsearch-7.4.2.jar:7.4.2]
	at org.elasticsearch.node.Node.<init>(Node.java:255) ~[elasticsearch-7.4.2.jar:7.4.2]
	at org.elasticsearch.bootstrap.Bootstrap$5.<init>(Bootstrap.java:221) ~[elasticsearch-7.4.2.jar:7.4.2]
	at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:221) ~[elasticsearch-7.4.2.jar:7.4.2]
	at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:349) [elasticsearch-7.4.2.jar:7.4.2]
	at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:159) [elasticsearch-7.4.2.jar:7.4.2]
	at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:150) [elasticsearch-7.4.2.jar:7.4.2]
	at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) [elasticsearch-7.4.2.jar:7.4.2]
	at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:125) [elasticsearch-cli-7.4.2.jar:7.4.2]
	at org.elasticsearch.cli.Command.main(Command.java:90) [elasticsearch-cli-7.4.2.jar:7.4.2]
	at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:115) [elasticsearch-7.4.2.jar:7.4.2]
	at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) [elasticsearch-7.4.2.jar:7.4.2]
[2020-07-10T19:16:49,226][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [node-141.56] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: java.lang.IllegalStateException: Node is started with node.data=false, but has shard data: [/tol/es-data/es742-prome/nodes/0/indices/wxAOP9NpRYiJ2SXujvEUBg/4, /tol/es-data/es742-prome/nodes/0/indices/88BeYJAnROKWDFJsk42ffg/5]. Use 'elasticsearch-node repurpose' tool to clean up
	at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:163) ~[elasticsearch-7.4.2.jar:7.4.2]
	at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:150) ~[elasticsearch-7.4.2.jar:7.4.2]
	at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[elasticsearch-7.4.2.jar:7.4.2]
	at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:125) ~[elasticsearch-cli-7.4.2.jar:7.4.2]
	at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-cli-7.4.2.jar:7.4.2]
	at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:115) ~[elasticsearch-7.4.2.jar:7.4.2]
	at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) ~[elasticsearch-7.4.2.jar:7.4.2]
Caused by: java.lang.IllegalStateException: Node is started with node.data=false, but has shard data: [/tol/es-data/es742-prome/nodes/0/indices/wxAOP9NpRYiJ2SXujvEUBg/4, /tol/es-data/es742-prome/nodes/0/indices/88BeYJAnROKWDFJsk42ffg/5]. Use 'elasticsearch-node repurpose' tool to clean up
	at org.elasticsearch.env.NodeEnvironment.ensureNoShardData(NodeEnvironment.java:1081) ~[elasticsearch-7.4.2.jar:7.4.2]
	at org.elasticsearch.env.NodeEnvironment.<init>(NodeEnvironment.java:325) ~[elasticsearch-7.4.2.jar:7.4.2]
	at org.elasticsearch.node.Node.<init>(Node.java:275) ~[elasticsearch-7.4.2.jar:7.4.2]
	at org.elasticsearch.node.Node.<init>(Node.java:255) ~[elasticsearch-7.4.2.jar:7.4.2]
	at org.elasticsearch.bootstrap.Bootstrap$5.<init>(Bootstrap.java:221) ~[elasticsearch-7.4.2.jar:7.4.2]
	at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:221) ~[elasticsearch-7.4.2.jar:7.4.2]
	at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:349) ~[elasticsearch-7.4.2.jar:7.4.2]
	at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:159) ~[elasticsearch-7.4.2.jar:7.4.2]
	... 6 more

两种解决方法：

1. 直接去es的数据存储目录，把里面的 nodes/0 这个目录直接干掉

2. 运行 bin 目录下的 elasticsearch-node 命令，记得加参数 repurpose

   ./elasticsearch-node repurpose
   

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