I am currently changing my ElasticSearch schema.
I previously had one type `Product` in my index with a nested field `Product.users`.
And I now wants to get 2 different indices, one for `Product`, an other one for `User` and make links between both in code.

I use `reindex` API to reindex all my `Product` documents to the new index, removing the `Product.users` field using script:

> 
> ctx.\_source.remove('users');
> 
> 
> 

But I don't know how to reindex all my `Product.users` documents to the new `User` index as in script I'll get an ArrayList of `users` and I want to create one `User` document for each.

Does anyone knows how to achieve that?