code: public OperationFuture<List<AlertPolicy>> delete(AlertPolicyFilter filter) {
          List<AlertPolicy> policyRefs = getRefsFromFilter(filter);
          return delete(policyRefs.toArray(new AlertPolicy[policyRefs.size()]));
      }
docs: Remove Alert policies
  
  @param filter the search policies criteria
  @return OperationFuture wrapper for list of AlertPolicy