Currently our organisation has confluence installed.Its hosted on Data center.
My query is that only plug-in available for data center can be installed?
There is nothing that will stop you installing a server only app/addon in a data center environment, however depending on what the app does and how it’s developed, the app may not behave correctly if you do have data center validated apps. My suggestion is to steer towards data center apps where possible, and if an app is critical but only available for server - read reviews, do significant testing on your non-production instance and if possible think about what the app does - if it’s reliant on the search index for example, this needs to be replicated between each DC node and each servers index may not be an exact match of the others, so do more testing for the app type. If the app is more of a front end only tool, then the chances of DC specific issues are usually lower so using server only versions may not be as much of a problem.
CCM