def drop_user(user, options = nil)
      policy = create_policy(options, AdminPolicy, default_admin_policy)
      command = AdminCommand.new
      command.drop_user(@cluster, policy, user)
    end
def drop_user(user, options = nil)
      policy = create_policy(options, AdminPolicy, default_admin_policy)
      command = AdminCommand.new
      command.drop_user(@cluster, policy, user)
    end
Remove user from cluster.