How to retrieve all existing indeces in painless

Question

I'm wanting to retrieve the number of indices in my ES cluster from within a scripted field of an aggregation.

I know you can access some context values with ctx._source but does anyone know how to get the total number of indeces from my cluster?

Thanks!

Answer 1

That's not possible. The ctx context has no idea about the state of your cluster. It has only access to the currently iterated doc.