code: public Observable<VaultInner> getByResourceGroupAsync(String resourceGroupName, String vaultName) {
          return getByResourceGroupWithServiceResponseAsync(resourceGroupName, vaultName).map(new Func1<ServiceResponse<VaultInner>, VaultInner>() {
              @Override
              public VaultInner call(ServiceResponse<VaultInner> response) {
                  return response.body();
              }
          });
      }
docs: Get the Vault details.
  
  @param resourceGroupName The name of the resource group where the recovery services vault is present.
  @param vaultName The name of the recovery services vault.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the VaultInner object