Dovecot - Upgrade Solr 7.7.2 to 8.4.1

Hello, I have Dovecot configured with Solr for the indexes.

I have need your support for upgrade solr 7.7.2 to 8.4.1. Solr 7.7.2 has a security issue CVE-2019-12409.

It's possible upgrade of Solr? Dovecot work correctly with Solr 8.x?

The Solr documentation recommended after updating: "It is always strongly recommended that you fully reindex your documents after a major version upgrade."

There are tips for Dovecot?

Br, Domenico