Does _update_by_query support doc {} or only script?
I'd like to update the doc's using values. In a similar way _update works, by passing doc {}.
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I also would like to have this feature. Any plans for this?
This is tracked as a "we don't know" feature request here.
In 5.0 this becomes less important because 5.0 ships with Painless which is a scripting language that is enabled by default because it is safe. Personally I prefer it having to reason about what the doc merging code does and I'm quite familiar with that code. I get the appeal though. It "just works" in lots of cases.