I don't know it it's standard, but I always upgrade as follows:
java -jar /path/to/gerrit-2.13.7.war init -d ${site_path}/ --delete-caches --no-auto-start
java -jar ${site_path}/bin/gerrit.war reindex --threads 20 -d ${site_path}
And of course you should always read the release notes for every version between you current version, and the version you are upgrading to.