Hi @maziyar,

We tried in house upgrade cluster from CDH5.16 to CDH6.1 without Solr being installed. We can't reproduce the issue. Hue works as expected.

Your hue config lists the "solr_url: https://localhost:8983/" under "search" is a bit suspicious though. If Solr is not installed on the cluster, you should be able to see "search" in your app_blacklist in your hue.ini as following:

[desktop]
app_blacklist=search

It's not clear how your cluster ends up with this status. One suggestion can be adding "search" in the app_blacklist as above and restart Hue. It should be able to resolve your issue. 

Please let us know if it helps.

Thanks!

Weixia