Er, your question says you are using JIRA 7.1 and you want to upgrade it to 7.1. There's no changes between those two versions.
However, you can find lists of changes for all versions under https://confluence.atlassian.com/jiracore/jira-core-release-notes-781386726.html
If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...
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