If I remember correctly, Yahoo Open Source their current and next generation Search Engine Vespa [1], why wasn't that used, and instead starting from scratch?
[1] https://vespa.ai
[1] https://vespa.ai
Work on Cliqz Search started way earlier ~2013. Our work on Kubernetes and modernizing our architecture was also started around year 2016.
[1] https://www.verizonmedia.com/press/open-sourcing-vespa-yahoo...