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Operating System:
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Steps To Reproduce:
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Create a new document in which a field contains umlauts.
Example: `{"a": "äÄöÖüÜ"}`

Create a new aggregation pipeline

Add a project stage that contains the operation `$toLower` and/or `$toUpper`.
Example: `{$project: {"upper": {$toUpper: "$a"}, "lower": {$toLower: "$a"}}`
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Create a new document in which a field contains umlauts. Example: `{"a": "äÄöÖüÜ"}` Create a new aggregation pipeline Add a project stage that contains the operation `$toLower` and/or `$toUpper`. Example: `{$project: {"upper": {$toUpper: "$a"}, "lower": {$toLower: "$a"}}`

Umlauts (äÄ,öÖ,üÜ) are not converted to their lower or upper case with the aggregation pipeline operations `$toLower` or `$toUpper`.