The Microsoft announced the most awaited and productive feature for Azure Cosmos DB in the Build 2021 event that is to update the partial document in the Azure Cosmos DB.
Previously, the developer needed to call the whole document in the program and replace the entire document even for a single field update. This process involved the round trip to the server. This process consumes lots of request units for each request which directly impact on cost increase.
The partial update document feature is available for Core (SQL) API using the .NET SDK, Java SDK and stored procedures. The developer can sign up for a private preview using the following link to test the applications.