x-content: Support collapsed named objects (backport of #50564) #50619
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This adds support for "collapsed" named object to
ObjectParser
. Inparticular, this supports the sort of xcontent that we use to specify
significance heuristics. See #25519 and this example:
I believe there are a couple of things that work this way.
I've held off on moving the actual parsing of the significant heuristics
to this code to keep the review more compact. The moving is pretty
mechanical stuff in the aggs framework.