Thanks again for replying.
It's what I would have liked to avoid. Because I want to update only one document each time. For now I'm doing that, but I would have prefered to process only one update instead of a get and then an update. Even if I know an update is not only an update under the hood.
I'd like to use Elasticsearch as a datastore and not only as a search engine. I understand this kind of feature is not really necessary for a search engine. I don't have to do many updates, so getting the data before updating them is acceptable.
Thanks anyway for your help.