code: public Observable<Void> enableKeyVaultAsync(String resourceGroupName, String accountName) {
          return enableKeyVaultWithServiceResponseAsync(resourceGroupName, accountName).map(new Func1<ServiceResponse<Void>, Void>() {
              @Override
              public Void call(ServiceResponse<Void> response) {
                  return response.body();
              }
          });
      }
docs: Attempts to enable a user managed key vault for encryption of the specified Data Lake Store account.
  
  @param resourceGroupName The name of the Azure resource group that contains the Data Lake Store account.
  @param accountName The name of the Data Lake Store account to attempt to enable the Key Vault for.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceResponse} object if successful.