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Hi felix.pries@icloud.com,
Thank you for your report. I understand that $toLower and $toUpper are not working with äüö(and upper-case umlauts). This is expected behavior because MongoDB aggregation pipeline operator $toUpper only has a well-defined behavior for strings of ASCII characters, and the same applies to $toLower.
I can see how this behavior would be valuable for supporting non-ASCII characters. However, this JIRA project is for bug reports, but you can help get this on the radar by submitting a feature request to our MongoDB Feedback Engine.
You may also want to search and post on the MongoDB Developer Community Forums, as it's possible there are others who have guidance on how to satisfy your use case.
Regards,
Yuan
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