After IOP upgrade the reports are empty

The Issue:
After an IOP (Insights On-Premises) upgrade, all reports return an errorThe Cause:
In rare scenarios the upgrade might cause cleanup of indexed data and rebuild is necessary to create the available data sets. 

The Solution:
Please go to the data model settings and rebuild your data sets acceleration.
To reach the data model settings page, type your Insights URL and add manager/search/data_model_manager.
For example: http://servername.domain.com:8000/en-US and to it add manager/search/data_model_manager
http://servername.domain.com:8000/en-US/manager/search/data_model_manager 
Once you reach the settings page, please click on rebuild for each report's data set.
The rebuild takes few minutes, check the Insights reports after 30 minutes.

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