Update Classification using Apache ATLAS REST API

Question

I would like to update tags associated to an entity using apache ATAS REST API.

For example :

Entity with this guid:81a38d33-a646-4bf6-9310-452947cc5a5a has three tags associated to it [main_tag,support_tag,conf_tag] I want to have new tags associated to this guid ex: [new_tag1,new_tag2] and delete the old ones.

I tried the update using the rest api from apache atlas it doesn't seem to work.

https://atlas.apache.org/api/v2/