docs: public Observable<ManagedBackupShortTermRetentionPolicyInner> getAsync(String resourceGroupName, String managedInstanceName, String databaseName) {
          return getWithServiceResponseAsync(resourceGroupName, managedInstanceName, databaseName).map(new Func1<ServiceResponse<ManagedBackupShortTermRetentionPolicyInner>, ManagedBackupShortTermRetentionPolicyInner>() {
              @Override
              public ManagedBackupShortTermRetentionPolicyInner call(ServiceResponse<ManagedBackupShortTermRetentionPolicyInner> response) {
                  return response.body();
              }
          });
      }