Queue messages get their id from body of message.

I am not sure if this is intentional but if a message contains an "Id" field it seems to be used as the `id` property in `QueueMessage`. I assume that this has something to do with how the contents of `trigger_metadata` are set (I am unable to identify the origin of the argument). I assume this because of how it is being extacted in `QueueMessageInConverter` and the fact that my messages arrive with the same `body['Id']` and `msg.id`.

Maybe I am completly wrong but I am curious if this is intentional or aviodable somehow, if not I would like to open a discussion about it.

I personally did not expect this behaviour and it required a ugly workaround.

まず、レポートで言及されている QueueMessageInConverter と trigger_metadata 引数を追跡し、次にメッセージ本文の Id と QueueMessage.id を比較します。この動作が意図したものかどうか、また値がどこから来ているのかを判断します。動作が明らかになり、誤っている場合は焦点を絞った回帰テストでカバーされれば完了です。

索引モデルが issue の本文から書いたものです。