Assemble multiple fields into one category

Hello ,

I'm trying to display the countries with most population in the world, so ,I want to have a piechart displaying CHINA , INDIA and a category called 'the rest of the world' containing all the remaining countries in the world.
Is this use case possible using Kibana?

yes, use the other bucket setting on the term aggregation to display other countries

(thats available since 6.2)

So, Is there other ways using filters to do the task as I'm using kibana 5?