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Filled maps required the Geo-coding by region. It simply means for particular region or area which you need to show as filled, you need to have its border coordinates.
Then in tableau you need to use mark type as polygon which will draw these borders and can be filled with the same. There is a website which has filled level data by districts.
This is pretty old but there is a website where .tde files are attached for all the regions which I am not able to find it now.
I will repost the link if I get it.