I have not heard from anyone who has tried this. There is no neo4j connector code in the project.
To the extent that you can use neo4j with Hadoop, you can use it with Mahout; Mahout has little to do with specific data stores.
What good news, I suppose; there is little to do with Mahut, who is especially attached to the data warehouse, so yes with a little work, I'm sure you can do something.
, Mahout, .