code: public ServiceFuture<BackupShortTermRetentionPolicyInner> beginUpdateAsync(String resourceGroupName, String serverName, String databaseName, Integer retentionDays, final ServiceCallback<BackupShortTermRetentionPolicyInner> serviceCallback) {
          return ServiceFuture.fromResponse(beginUpdateWithServiceResponseAsync(resourceGroupName, serverName, databaseName, retentionDays), serviceCallback);
      }
docs: Updates a database's short term retention policy.
  
  @param resourceGroupName The name of the resource group that contains the resource. You can obtain this value from the Azure Resource Manager API or the portal.
  @param serverName The name of the server.
  @param databaseName The name of the database.
  @param retentionDays The backup retention period in days. This is how many days Point-in-Time Restore will be supported.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object