Bitbucket upgrade broke the search.

[Per Lanvin]

Hi,

After having successfully upgraded Bitbucket 6.6.2 =>7.5.1 the search fucntion (see attached image) is no longer working. Everything else seems fine.

I do not find anything useful in the logs .. have tried delete index > reindex etc according to:
https://community.atlassian.com/t5/Bitbucket-questions/Bitbucket-Search-Unavailable/qaq-p/1096093
https://confluence.atlassian.com/bitbucketserverkb/bitbucket-server-code-search-is-unable-to-find-results-from-some-or-all-repositories-858783145.html
but none have had any effect.

Any hints on how to solve this would be greatly appreciated.

Thank you.