code: public Observable<Page<FileServerInner>> listByWorkspaceAsync(final String resourceGroupName, final String workspaceName) {
          return listByWorkspaceWithServiceResponseAsync(resourceGroupName, workspaceName)
              .map(new Func1<ServiceResponse<Page<FileServerInner>>, Page<FileServerInner>>() {
                  @Override
                  public Page<FileServerInner> call(ServiceResponse<Page<FileServerInner>> response) {
                      return response.body();
                  }
              });
      }
docs: Gets a list of File Servers associated with the specified workspace.
  
  @param resourceGroupName Name of the resource group to which the resource belongs.
  @param workspaceName The name of the workspace. Workspace names can only contain a combination of alphanumeric characters along with dash (-) and underscore (_). The name must be from 1 through 64 characters long.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;FileServerInner&gt; object