If you have followed my posts on how to install Jira, Confluence and Bitbucket in past, you probably have ended up installing Posgresql-server version 9.2. That version still is the latest version that Centos7 has on its official repository.
The problem is Atlassian dropped support for that version few months back but you still could install the updates. Last month when I updated to the latest version of Jira (7.11.0), I had an oops!! moment when server failed to start due to unsupported database server. Luckily I had a recent full back-up of the server and could recover easily.