How do I enable Dynamic Graphs while using the default Docker image `janusgraph/janusgraph:latest`?

 environment:
      janusgraph.set-vertex-id: true
      storage.backend: cql
      storage.hostname: sdb:9042
      janusgraph.index.search.backend: elasticsearch
      janusgraph.index.search.hostname: index:${ELASTIC_PORT-.env ELASTIC_PORT needs to be set}