Looks like it has been abandoned:
Hi all,
I wanted to take a moment and let the community-at-large know
that we are going to end-of-life the Luwak functionality in Riak, as
part of our 1.1 release in February. This simply means that the Luwak
repo on Github will not be actively developed/supported by Basho, or
included as a default Riak dependency. In keeping with our commitment
to Open Source, the code will still be available if someone else wants
to develop on it. You can also continue to use it with Riak if you are
willing to edit the deps and compile from source -- the Luwak README
will contain information on how to do this.
While the idea of Luwak
was interesting, we ultimately decided that it wasn’t the
architectural path we wanted to pursue for storing larger values in
Riak. If Luwak is a piece of your Riak deployment, we’d love to hear
from you and incorporate your feedback into future directions.
Please don’t hesitate to reach out to myself or Mark Phillips.
Thanks, D.
The last commit on the open-source project was a little over 3 years ago, and it's had an outstanding pull request open for 10 months (the comments on there are not encouraging either). So yeah, I'd say it's pretty dead.