Can't get clusterName

[MarsBighead]

The default Pool data structure can not match the Couchbase RESTful API pool/default. Pool struct can not only cover 3 fields while the API(Version: EE6.0.0) has more.

// A Pool of nodes and buckets.
type Pool struct {
	BucketMap map[string]*Bucket
	Nodes     []Node

	BucketURL map[string]string `json:"buckets"`

	client Client
}

I think ClusterName is an important field for cluster overview, and the structure can match the API better if the other fields in the API have been added.