核心参考：https://www.elastic.co/guide/e ... .html
官网的解读：
By default a node is a master-eligible node and a data node, plus it can pre-process documents through ingest pipelines. This is very convenient for small clusters but, as the cluster grows, it becomes important to consider separating dedicated master-eligible nodes from dedicated data nodes.
解释为：小集群，默认配置（mastre:true, data:true)就可以。
Now imagine that you have a cluster with three master-eligible nodes, and minimum_master_nodes set to 2. If a network split separates one node from the other two nodes, the side with one node cannot see enough master-eligible nodes and will realise that it cannot elect itself as master. The side with two nodes will elect a new master (if needed) and continue functioning correctly. As soon as the network split is resolved, the single node will rejoin the cluster and start serving requests again.
解释为：如果存在网络问题，导致其中一个节点down掉，另外两个节点仍然可以选为主节点。待网络问题回复后，原来down掉的节点可以重新加回集群。
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laoyang360 - 《一本书讲透Elasticsearch》作者，Elastic认证工程师 [死磕Elasitcsearch]知识星球地址：http://t.cn/RmwM3N9；微信公众号：铭毅天下; 博客：https://elastic.blog.csdn.net
赞同来自:
节点1,master为true,date为true
节点2,master为true,date为true
节点3,master为true,date为flase
路由节点。
方法2:
节点1,master为true,date为true
节点2,master为true,date为true
节点3,master为true,date为true
核心参考：https://www.elastic.co/guide/e ... .html
官网的解读：
By default a node is a master-eligible node and a data node, plus it can pre-process documents through ingest pipelines. This is very convenient for small clusters but, as the cluster grows, it becomes important to consider separating dedicated master-eligible nodes from dedicated data nodes.
解释为：小集群，默认配置（mastre:true, data:true)就可以。
Now imagine that you have a cluster with three master-eligible nodes, and minimum_master_nodes set to 2. If a network split separates one node from the other two nodes, the side with one node cannot see enough master-eligible nodes and will realise that it cannot elect itself as master. The side with two nodes will elect a new master (if needed) and continue functioning correctly. As soon as the network split is resolved, the single node will rejoin the cluster and start serving requests again.
解释为：如果存在网络问题，导致其中一个节点down掉，另外两个节点仍然可以选为主节点。待网络问题回复后，原来down掉的节点可以重新加回集群。