code: public PolicySetDefinitionInner getAtManagementGroup(String policySetDefinitionName, String managementGroupId) {
          return getAtManagementGroupWithServiceResponseAsync(policySetDefinitionName, managementGroupId).toBlocking().single().body();
      }
docs: Retrieves a policy set definition.
  This operation retrieves the policy set definition in the given management group with the given name.
  
  @param policySetDefinitionName The name of the policy set definition to get.
  @param managementGroupId The ID of the management group.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws ErrorResponseException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the PolicySetDefinitionInner object if successful.