Hello Minako,
The conversation and the documentation which is referenced there is related to our GoodData Platform product, not GoodData Cloud.
It’s true that GoodData Cloud doesn’t support Mongo DB directly out of the box as you can see in the doc. However, you could use Data Source Manager which is able to to manage Data Sources that GoodData cannot connect with JDBC drivers, for example:
• Files and object storage services like AWS S3
• MongoDB
• Elasticsearch
• Kafka
• REST API
Feel free to see more information here:
https://www.gooddata.com/docs/cloud/connect-data/concepts/data-source-manager/#DataSourceManager-BenefitscomingfromDataSourceManagers