I have the same experience with monitoring plugin v1.5.6.
Moreover in my case this version almost break supporting of xep-0136.
Now I use next bunch: openfire v4.1.1 + monitoring plugin v1.4.5.
I need retrieving archived messages by xep-0136.
But in version 1.4.5 also have list of issues one of them related to timestamp of messages and conversations.
I see Monitoring Plugin version 1.57 is out and in it's changelog it mentions this problem:
1.5.7 -- May 19, 2017
- [OF-1334] - Monitoring Plugin displays "Archive index rebuild failed"
That link shows the issue is 'resolved' but the 'fix version' is 4.1.5
Does that mean the issue is fixed with plugin v1.57 in the upcoming release of Openfire v4.15? OR is it fixed with any version of Openfire as long as you are using Monitoring plugin v1.57?
It should be fixed in 1.5.7 for any Openfire version. JIRA only has a project for Openfire, so there is no other way as to file a fix for a plugin for an upcoming version of Openfire. But the fix is already in the updated version of a plugin.