I'm having problems with closing repositories in Nexus, whenever I deploy a
release and try to close the repository, it gets stuck on running a
Uniqueness Validation Check. Because it is stuck in a transitional state, I
cannot drop it, nor do anything with it.

So far, I have done two attempts that resulted in closing repositories in
Nexus.
https://repository.jboss.org/nexus/#stagingRepositories

One of them is jboss_releases_staging_profile-15214 and the other one,
jboss_releases_staging_profile-15217. I can see that there are other
repositories not created by me, but also stuck in the same situation: 15218
(created by James Perkins, in CC), 15216, created by rh-engineering-ema
user, and 15210 by user rhn-support-rsigal.

Can someone check what is wrong with Nexus, or if there is something wrong,
whatever it may be, with my release?

Thanks a lot, there are several releases that are needed for JBoss EAP, so
I really appreciate your help.