Provide an API capable to find AccountId based on email

Based on the deprecation note

https://developer.atlassian.com/cloud/confluence/deprecation-notice-search-api

the new API endpoint /wiki/rest/api/search/user accepts only the following fields: 

• Full name
• Public name
• AccountID

However, please consider that:

1. Full name could be easily duplicated in a big organization ( e.g. there could be two persons called "Patrick Dupont").
2. Public name is customized by the user, therefore Public name can't be used as a unique identifier.

I kindly ask you to implement an API that is capable of providing the AccountID based on the email.

The goal here is to find a user with a “strong” search based on a unique identity (here the email).