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https://issues.apache.org/jira/browse/SOLR-10035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15840067#comment-15840067
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Shawn Heisey commented on SOLR-10035:
-------------------------------------

Fixing the UI (the focus of this issue) is easy - one string on one line.

The larger concern is that the API for getting statistical information out of 
Solr has changed in a minor release, in a way that can break clients, and 
nothing in CHANGES.txt indicated that there was such a change.  I understand 
the desire to remove "HANDLER" from the category names -- it's unnecessarily 
verbose.  If it were me making the improvements, I would have left the category 
names unchanged in 6.x, only making the changes in master.

Users expect that their client code will continue working if they make a minor 
version upgrade, and for the most part Solr has kept that promise.  Sometimes 
progress *requires* changes that break user expectations, but in that case, it 
should be mentioned in the changelog.

> Admin UI cannot find dataimport handlers
> ----------------------------------------
>
>                 Key: SOLR-10035
>                 URL: https://issues.apache.org/jira/browse/SOLR-10035
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: UI
>    Affects Versions: 6.4.0
>            Reporter: Shawn Heisey
>            Assignee: Andrzej Bialecki 
>              Labels: regression
>             Fix For: master (7.0), 6.4.1
>
>
> The 6.4.0 version of Solr has a problem with the Dataimport tab in the admin 
> UI.  It will say "Sorry, no dataimport-handler defined" when trying to access 
> that tab.
> The root cause of the problem is a change in the /admin/mbeans handler, by 
> SOLR-9947.  The section of the output where defined dataimport handlers are 
> listed was changed from QUERYHANDLER to QUERY.



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