In section "8.8. CONFIGURING SHARDED QUEUES" the following is stated:

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To tie particular messages to a particular queue, clients can specify a message group for each message. A message group is associated with a specific queue and therefore all messages sent to any one group are always sent to the same queue.
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If the consumer who was previously chosen to consume the messages closes. Will the message still be sent to the "same queue" as the original messages?
Either way it would be good to add context to that statement in the docs.