code: public StorageAccountListKeysResultInner regenerateKey(String resourceGroupName, String accountName, String keyName) {
          return regenerateKeyWithServiceResponseAsync(resourceGroupName, accountName, keyName).toBlocking().single().body();
      }
docs: Regenerates one of the access keys for the specified storage account.
  
  @param resourceGroupName The name of the resource group within the user's subscription. The name is case insensitive.
  @param accountName The name of the storage account within the specified resource group. Storage account names must be between 3 and 24 characters in length and use numbers and lower-case letters only.
  @param keyName The name of storage keys that want to be regenerated, possible vaules are key1, key2.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws CloudException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the StorageAccountListKeysResultInner object if successful.