Hello @shashank ,
Please perform the following troubleshooting
1.Please make sure this site collection is added to content source & crawled successfully.
2.Make sure Microsoft SharePoint Foundation Usage Data Import and Microsoft SharePoint Foundation Usage Data Processing timers jobs are running.
3.Check the SharePoint ULS Logs to check proper logs files are being generated.
- C:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\LOGS
4.If the SarePoint Server says Upgrade Available. Please make sure you install the latest CU and run PSConfig Wizard in all the SharePoint Servers.
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