code: public Observable<ServerInner> createAsync(String resourceGroupName, String serverName, ServerForCreate parameters) {
          return createWithServiceResponseAsync(resourceGroupName, serverName, parameters).map(new Func1<ServiceResponse<ServerInner>, ServerInner>() {
              @Override
              public ServerInner call(ServiceResponse<ServerInner> response) {
                  return response.body();
              }
          });
      }
docs: Creates a new server or updates an existing server. The update action will overwrite the existing server.
  
  @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 parameters The required parameters for creating or updating a server.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable for the request