Such scenarios are not common, that you need to use K2 with NoSQL databases. However, I would still like to show the possibility of a K2 platform to connect to NoSQL databases to 'CRUD' data. Moreover, the REST API I am trying to show is kind of dynamic. The object schema as well as the collection you are working with completely depends on the swagger schema you use with K2 REST Broker. The current approach is also suitable for a K2 Cloud platform.