code: public Observable<ServerCommunicationLinkInner> beginCreateOrUpdateAsync(String resourceGroupName, String serverName, String communicationLinkName, String partnerServer) {
          return beginCreateOrUpdateWithServiceResponseAsync(resourceGroupName, serverName, communicationLinkName, partnerServer).map(new Func1<ServiceResponse<ServerCommunicationLinkInner>, ServerCommunicationLinkInner>() {
              @Override
              public ServerCommunicationLinkInner call(ServiceResponse<ServerCommunicationLinkInner> response) {
                  return response.body();
              }
          });
      }
docs: Creates a server communication link.
  
  @param resourceGroupName The name of the resource group that contains the resource. You can obtain this value from the Azure Resource Manager API or the portal.
  @param serverName The name of the server.
  @param communicationLinkName The name of the server communication link.
  @param partnerServer The name of the partner server.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the ServerCommunicationLinkInner object