code: public OperationFuture<List<AlertPolicy>> delete(AlertPolicy... policyRefs) {
          List<AlertPolicy> policiesList = Arrays.asList(policyRefs);
  
          List<JobFuture> jobs = policiesList.stream()
              .map(ref -> delete(ref).jobFuture())
              .collect(toList());
  
          return new OperationFuture<>(
              policiesList,
              new ParallelJobsFuture(jobs)
          );
      }
docs: Remove Alert policies
  
  @param policyRefs policy references
  @return OperationFuture wrapper for list of AlertPolicy