Need way to create collections via the Mongo DB API with a specified RU throughput
Developers using the MongoDB API should be able to programmatically create collections of a given RU throughput, similar to the capability that the DocumentDB API already provides.
The MongoDB API has no extensions that allow for this capability. The recommended method is to use the SQL API for .NET. Read more here, https://docs.microsoft.com/en-us/azure/cosmos-db/set-throughput#throughput-faq
Cao Trong Thang commented
Seem it is possible from 3.6, you can use the custom command to create a collection with a specified throughput: https://docs.microsoft.com/en-us/azure/cosmos-db/mongodb-custom-commands#create-collection