cc @yizeli, @solste7en, @vvakar

Thanks for getting back on this Costin. Is es.write.operation also going to allow upsert (in addition to index|create|update)? Upsert's the one I'm very interested in.

Thanks!
-Val

Upsert is a dedicate type of update. In fact, the current update is an actual upsert in that it 'merges' the given document with the target. I need to spend some time on verifying the other options but since the document is always present, having update as in using script support might not make sense and simply be unsupported.

Does update also insert if the document is not present?

Yes (this is what upsert is after all) - this is controlled through es.upsert.doc param which is by default set to true. If it's set to false, it will become just update (that is, only update the doc if it exists).
Apologies if the information is scarce, I'm working on updating the docs once things stabilize.

That's awesome. Thanks for the hard work!

Closing the issue.