code: public ServiceFuture<Void> beginDeleteAsync(String locationName, String longTermRetentionServerName, String longTermRetentionDatabaseName, String backupName, final ServiceCallback<Void> serviceCallback) {
          return ServiceFuture.fromResponse(beginDeleteWithServiceResponseAsync(locationName, longTermRetentionServerName, longTermRetentionDatabaseName, backupName), serviceCallback);
      }
docs: Deletes a long term retention backup.
  
  @param locationName The location of the database
  @param longTermRetentionServerName the String value
  @param longTermRetentionDatabaseName the String value
  @param backupName The backup name.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object