Hi, currently we absolutely do not plan to create a search engine: it requires too much resources for self hosting,
I think we currently have great option for all the spectrum (From Google search to DuckDuckGo), and because an open source search engine will be tricked by all kind of nasty SEO Experts and it will be very hard to promote actually good Content.
I dared the Google comparison thinking about it's productivity suit, and because they have an app for all the need of our life. At an extraordinary price, even if it cost noting.
Productivity is the current foundation, but you can think having a Bloom open source tractor in some years :)