Contents：
Cluster APIs
| API Name | Description |
|---|---|
| AddExistedInstances | Adds one or more existing instances to a cluster |
| CreateCluster | Creates a cluster |
| DeleteClusterInstances | Deletes one ore more nodes from a cluster |
| DescribeClusterInstances | Queries information of one or more nodes in the cluster |
| DescribeClusters | Queries cluster list |
