CompleteMultipartUploadResult has empty ETag response

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Hi,

When I was looking at a complete multipart upload request I found that the response did return an empty ETag entry in the XML.
If I query the keys metadata after the Complete is done it will return the expected ETag so it looks like it is calculated correctly.

<?xml version="1.0" encoding="UTF-8"?>
<CompleteMultipartUploadResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/";>
    <Location>testsystem/test/upload-file</Location>
    <Bucket>test</Bucket>
    <Key>upload-file</Key>
    <ETag></ETag>
</CompleteMultipartUploadResult>

I only have a cluster running on v17.2.3 so I haven't verified if this still exist on latest version.
I found an really old issue that was closed ~9 years ago with the same issue.
https://tracker.ceph.com/issues/6830

The problem is that my account to the tracker doesn't seams to work as is should so I can't login and comment on it or create a new ticket.

It also looks like there is a inconsistency between https://docs.ceph.com/en/latest/radosgw/s3/objectops/#complete-multipart-upload that says that ETag is required in the request but for eg. AWS documentation doesn't have it as a possible argument for the CompleteMultipartUpload so it is not possible to send using common third party libraries.

Best regards,
Lars Dunemark
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