code: public PolicyDefinitionInner getAtManagementGroup(String policyDefinitionName, String managementGroupId) {
          return getAtManagementGroupWithServiceResponseAsync(policyDefinitionName, managementGroupId).toBlocking().single().body();
      }
docs: Gets the policy definition at management group level.
  
  @param policyDefinitionName The name of the policy definition to get.
  @param managementGroupId The ID of the management group.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws CloudException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the PolicyDefinitionInner object if successful.