Arriba is a C# data engine designed for instant structured search, free text search, and data exploration across large single machine datasets. I've used it for a couple of side projects and it is working fine though I'm a little bit concerned about the continuity of it because as mentioned in project's readme that it is not owned by a dedicated team. I'm wondering if anyone is using it? If not, what else are you using to acheive the same (instant structured search)?