to clarify:

- highlighting: When searching with double quotes (phrase search) only the title is displayed in the search results, the text snippet with the page content snippet is not displayed. But here the same number results is found between 1.23 and 1.27 it just lacks some snippet for the page content?

- ranking: When searching without quotes, the snippet for the page content is shown but the results are worse (compared to the phrase search or compared to MW1.23?)

- missing content: When searching wikitext tags: a lot of pages are missing: this is not a highlighting problem here: when I searched for <tag> with MW 1.23: 50 pages were found, now with MW 1.27 only 3 are found. Does this problem apply only to tags, are there missing pages when searching normal text?

It looks like 3 different bugs to me, could you please confirm. We'll then be able to create some phabricator tickets to continue the discussion there.

Thanks!