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.

Start by tracing QueueMessageInConverter and the trigger_metadata argument mentioned in the report, then compare the message body’s Id with QueueMessage.id. Determine whether this behavior is intentional and where the value originates. Done means the behavior is clarified and, if incorrect, covered by a focused regression test.

Written by the indexing model from the issue text.