The successors of AbstractKeyValueObjectDataHandler are the default handler for reading and writing key value data (e.g. JSON).
The KeyValueDataHandler stores the key value pairs with a flat structure in one map in a KeyValueObject, in contrast to the NestedKeyValueObjectDataHandler, which stores the key value pairs in nested maps in a NestedKeyValueObject.
Functionality of this two slightly different handlers should be the same, but may differ in performance depending on use case.The KeyValueObject data handler can be used to handle json like data (see. KeyValue Feature for more information)