deploymentConfigName
If specified, the deployment configuration name can be either one of the predefined configurations provided with CodeDeploy or a custom deployment configuration that you create by calling the create deployment configuration operation.
CodeDeployDefault.OneAtATime
is the default deployment configuration. It is used if a configuration isn't specified for the deployment or deployment group.
For more information about the predefined deployment configurations in CodeDeploy, see Working with Deployment Configurations in CodeDeploy in the CodeDeploy User Guide.