operation Directory.SuggestEntries removes rows with the same "label" (9.10 backport)

In the operation Directory.SuggestEntries there is used the same mergeJsonAdapter(JSONAdapter branch) method for adding new entities for all cases.
The method uses the "children" property of type HashMap with key = "label" to temporary save results.
As a result, it removes records with the same "label" field but different all other fields including "id" for a flat directory and puts all children to one record for the parent directory.
But as a general rule only "id" field have to be unique.