It’s not just performance. I help people make search tech decisions and really the most important factor is mindshare. Can you hire people that work on it? Will the community be big enough to provide support, blog about best practices, put on conferences, write books on the technology? Are there company(s) behind the technology that provide products and services? Is the technology constantly being improved by the community for the use cases you care about? Will the technology be around in 5, 10, 20 years from now?
It’s hard to build that up and hard to overcome an incumbent like Lucene
That being said, it’s less hard to establish technology in a niche that Lucene-based search doesn’t do well yet.
Doug