code: public Observable<VaultInner> updateAsync(String resourceGroupName, String vaultName, VaultPatchParameters parameters) {
          return updateWithServiceResponseAsync(resourceGroupName, vaultName, parameters).map(new Func1<ServiceResponse<VaultInner>, VaultInner>() {
              @Override
              public VaultInner call(ServiceResponse<VaultInner> response) {
                  return response.body();
              }
          });
      }
docs: Update a key vault in the specified subscription.
  
  @param resourceGroupName The name of the Resource Group to which the server belongs.
  @param vaultName Name of the vault
  @param parameters Parameters to patch the vault
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the VaultInner object