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集群统计 API 提供了和 节点统计 相似的输出。 但有一个重要的区别：节点统计显示的是每个节点上的统计值，而 集群统计 展示的是对于单个指标，所有节点的总和值。
集群统计
节点统计
这里面提供一些很值得一看的统计值。比如说你可以看到，整个集群用了 50% 的堆内存，或者说过滤器缓存的驱逐情况不严重。这个接口主要用途是提供一个比 集群健康 更详细、但又没有 节点统计 那么详细的快速概览。对于非常大的集群来说也很有用，因为那时候 节点统计 的输出已经非常难于阅读了。
集群健康
这个 API 可以像下面这样调用：
GET _cluster/stats
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