You're seeing just the callback unsubscribe_from_stream, go back to EventStore module for more information.
Link to this callback

unsubscribe_from_stream(stream_uuid, subscription_name, opts)

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  stream_uuid :: String.t(),
  subscription_name :: String.t(),
  opts :: options()
) :: :ok

Unsubscribe an existing subscriber from event notifications.

  • stream_uuid is the stream to unsubscribe from.

  • subscription_name is used to identify the existing subscription process to stop.

Returns :ok on success.