The Drop Cluster command definitely deletes a cluster. This will delete the cluster, all its records and will clear all caches. NOTE: Unless you've made backups there is no way to restore a deleted cluster.
DROP CLUSTER <cluster-name>
Delete the current local database:
DROP CLUSTER Person
deletes the cluster named 'Person' with all Person records.
To create a new cluster use the Create Cluster command.
To know more about other SQL commands look at SQL commands.
This is a command of the Orient console. To know all the commands go to Console-Commands.