If you do not use sessions, remote requests to Gremlin Server are committed automatically, see: https://tinkerpop.apache.org/docs/current/reference/#considering-transactions .

Are you sure that committing a modification is sufficient to move over the change from the transaction cache to the database cache, botth in the current and in your new ReDis implementation? Maybe you can test by having a remote modification test followed by a retrieval request of the same vertex from the same client, so that the database cache is filled explicitly (before the second client attempts to retrieve it).

Marc