Yes it should! But...the delete index api needs some refactoring (there's a TODO in `TransportDeleteIndexAction` as well). Although the api does support multiple indices, it updates the cluster state only for one index at a time, and there's a metadata lock involved too (per index). We also need to change the way we handle failures, since if one of the delets fail we return an error but it is not clear which operation(s) failed and which ones were successful. We should definitely work on this refactoring soon!