According to the image, 'E3L' is a component that connects the Storage Bucket and the SME Validation Action. This implies that 'E3L' is responsible for retrieving the documents from the storage and sending them to the SMEs for validation. This is an example of a Human in the Loop (HITL) scenario, where human intervention is required to complete the automation process. Therefore, 'E3L' can be considered as a Human in the Loop Performer, which is a role that enables human interaction with the automation solution1.
References: Human in the Loop