6.3 to 7.1 is the largest jump I'd make inside your area, and that can be painful.
I'd strongly recommend an upgrade to 6.4.latest. This will minimise the issues you have going from 6.4 to 7.0, and I would test a 6.4 to 7.3 direct upgrade - it has worked for me recently (if you have problems, then fall back to 6.4 to 7.0 or 7.1 - the upgrades from 7.0 to 7.3 are relatively painless)
Do you have any reference guides or help, we need to upgrade from 6.3 to something supported.
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You're going to see a lot of https://confluence.atlassian.com/adminjiraserver072/upgrading-jira-applications-828787633.html
But start with https://confluence.atlassian.com/jira064/upgrading-jira-using-a-rapid-upgrade-method-720411841.html to get you from 6.something to 6.4.latest
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