Since Mongo is schemaless, there is no need to specify schema, only collections must be created. Same for indexes - these are just classic (B-tree) indexes that work on any field type.
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‘충주맨’ 김선태, 개인 유튜브 시작… “자유롭게 방송하고 싶었다”
maintaining the application over time, that actor fits the most natural reading