Hi @Nitin Kumar ,
"but on August 2020 Classic usage and popularity reports has been discontinued, will it affect the search analytics data as well if yes is there any other way to get unique views for the list/Libraries items and files"
Yes, it will affect the historical data from these reports before August 7, 2020.
For the future data, it could be accessed with GetItemAnalytics Graph API or site usage page:
Reference:
Classic usage and popularity reports to be discontinued
Thanks
Best Regards
If the response is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.