Problem with searching (Solr?) after upgrade

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Hi everyone,

I've recently upgraded WebCon from 2020 to 2021 and everything went ok except quick search. The "search everything" in our main application results in no elements founded. However when switched to "All aplication" view I can see all results and everything works fine.

I suspect that the WEBCON Search service and its index is not up to date. Is there a way to rebuild that index?