Hi @Nguyen_Nhat_Tan thank you for your question and welcome to the MongoDB community!
Can you provide a bit more information on the question? It looks like you have multiple queries here that are using an index, but it looks like some of these queries might not be the most efficient as they are scanning 18.2k docs yet only returning a few. Do you see any index recommendations on the “Lumin_v2.documents” namespace?
Thanks!
Frank