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Dropping the cases and task collections in MongoDB also means that the collation is lost. Which This has the effect that searches in the dcm-lists DCM Lists service are not case-insesitive anymore. When possible try to only empty the collctions instead of dropping them in order to keep the correct collation. To re-create the collation do one of the following steps:

• When the collections are dropped, restart the dcm-lists application. This will trigger the creation of the collections with the correct collation.
• When the collections are droppped, manually recreate them the collections with the correct collation.

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collation: { locale: <your locale>, strength: 2 } }

For more information on Collationcollations, please refer to the documentation of of MongoDB.