I was part of a group that analyzed some of the security claims of the Mylar system. You can read about what we found here: https://eprint.iacr.org/2016/920.pdf
I created an updated version of that repo for a research project. Submitting a PR is on my to-do list. The changes needed to get search working aren't too bad once you figure out how the system works and where everything is. Updating the whole thing to more recent versions of Meteor was a little more annoying, in my opinion. There are also a couple of critical bugs in the code that need to be fixed before using it in production.
