Re-index with java api (ES 5.1.2)

Hi,
I have 2 indices: index_old and index_new.

I want to re-index all the data from index_old to index_new, and after that I want to delete index_old.

I’m not sure if by the time I get the response from the re-index request, all the data has been re-indexed and I can safely delete index_old.
the code I’m using is:
ActionResponse response = ReindexAction.INSTANCE.newRequestBuilder(client).
source(index_old).destination(index_new).get();

Can someone help?

Thanks!

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