Yu 14913fdc37 keep _parent field while updating child type mapping (#24407)
parent/child: Allow updating mapping without specifying `_parent` field on each update.

Prior to this change when a mapping has a `_parent` field then any update (also updates that didn't modify the `_parent` field) to the mapping involved specifying the `_parent` field again. With this change specifying the `_parent` field on each mapping update is no longer required.

Closes #23381
2017-06-07 10:51:21 +02:00
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