In less than a week, a new proposal for a group project will be discussed at WordCamp Europe / #WCEU (WP Cafe in Berlin @ 15:30 on Friday, the 21.06.2019):

TAGSEO is a collaborative, group project to develop, manage and improve advanced search capabilities, search functionality and search engine optimization within WordPress. To put it simply, it is an open source search engine based on WP data structures.

https://tagseo.wordpress.com/about/