node是一个指令，用于列出此集群中包含的节点。
Node is a directive that lists the nodes that are part of this cluster.
某些管理操作需要其包含的节点都是兼容的并且属于同样的节点组。
Certain administrative operations require that the nodes involved are all compatible and belong to the same node group.
做好理解结果的准备，因为结果中可能包含经过过滤的搜索结果中不包含的节点。
Be prepared to understand the results, which might include nodes that a filtered search would not include.
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