I had never seen the /solr/admin/metrics endpoint, so I tried to access it on my dev server. It threw an exception. This is the first line:
2017-09-1414:27:11.629ERROR (qtp1394336709-480905)[]o.a.s.h.RequestHandlerBaseorg.apache.lucene.store.AlreadyClosedException:Alreadyclosed The rest of the log information directly pertaining to this issue is available here for the next month: https://apaste.info/aXOm There isn't anything that *I* would consider to be particularly unusual about the setup. The version is 6.6.0. I do have a third-party plugin installed, and some update processors that I've written myself. I have no idea whether those could have caused this problem, but I think it's unlikely. The message does not say what index directory was being accessed when the problem occurred. I tried to use the branch_6_6 code so I could add the path to the index directory to the exception message, but with the generated 6.6.2-SNAPSHOT package, I couldn't get Solr to start properly. Some of my cores failed to initialize, and the logs are very unclear on what went wrong. Switching the service symlink back to 6.6.0 allowed everything to start correctly. I may need to check out the 6.6.0 source tag and modify that instead of trying to upgrade. Thanks, Shawn