As per the documentation:

Depending on the underlying configuration, the factory can return a new connection or an existing connection (when a pool or shared native connection is used).

So "shared native connection" is not what you want, according to your requirement.

When using Lettuce as the backing driver you would always get a multiplexed single connection to the Redis server, the only exceptions being cluster (where the connections are typycally 2 * N + 1, see explanation) or connection pooling (which does not seem to fit your requirement.

So for your case to work you only need to disable the "shared native connection".