hi,
I think that embedded cassandra can lead to some classpath hell, so this option should at least not be possible with default installation.

I have a project where I put my library into janusgraph in a first version. When I had to parse CSV, I found that JG embedded some old CSV libraries and updating them may have some unexpected issues on JG, so I have used this old version even if it was unperfect. In a second version, I use a spring boot application with a remote connection to JG to prevent such issues.

elasticsearch has disabled the embedded mode for this reason (see https://www.elastic.co/blog/elasticsearch-the-server ).

regards,
Nicolas