You only need to perform this step if you are setting up labs in your own AWS Account. Skip this step and continue to Configure AWS Cloud9 if you are in AWS instructor led workshop using Event Engine.
You can setup the lab environment including the DocumentDB Cluster by using the sample CloudFormation template provided in this repo. In this case you can skip Creating DocumentDB Cluster, which goes through how to create the DocumentDB Cluster manually.
You can also choose to setup the bare minimal lab environment without the DocumentDB Cluster by setting
migrationResources=false in Setup Lab Environment page. In this case, you will have to follow Introduction module to create the DocumentDB Cluster.
Complete the following steps based on your choice: