A unique identifier that you specify. This identifier is not the same as the pipeline identifier assigned by AWS Data Pipeline. You are
responsible for defining the format and ensuring the uniqueness of this identifier. You use this parameter to ensure idempotency during
repeated calls to CreatePipeline. For example, if the first call to CreatePipeline does not return a clear success, you can
pass in the same unique identifier and pipeline name combination on a subsequent call to CreatePipeline. CreatePipeline
ensures that if a pipeline already exists with the same name and unique identifier, a new pipeline will not be created. Instead, you'll
receive the pipeline identifier from the previous attempt. The uniqueness of the name and unique identifier combination is scoped to the AWS
account or IAM user credentials.
Constraints:

C# |
public string UniqueId { get; set; }