Stargate.Receiver.ack

You're seeing just the function ack, go back to Stargate.Receiver module for more information.
Link to this function

ack(receiver, message_id)

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Specs

ack(GenServer.server(), message_id()) :: :ok | {:error, term()}

Sends an acknowledgement of the given message ID back to the Pulsar cluster via the provided websocket process connection. This is required for all Stargate consumers and readers where acknowledgement signals the cluster to delete messages from the topic/subscription and send more while readers require acknowledgement to signal readiness for more messages.