It seems like taskDefinition is used for the service name. I currently have taskDefinition for old names. Does it mean that I need to deregister these definitions first? This should be automated via ecs-cli
--project-name in ecs cli service up works
Specifies the project name to use. If the COMPOSE_PROJECT_NAME environment variable is set when ecs-cli compose is run, then the project name is set to the value of that environment variable.
Type: String
Default: The current directory name.
Required: No