Jim Ferenczi d241c4898e Removes parent child fielddata specialization (#24737)
This change removes the field data specialization needed for the parent field and replaces it with
a simple DocValuesIndexFieldData. The underlying global ordinals are retrieved via a new function called
IndexOrdinalsFieldData#getOrdinalMap.
The children aggregation is also modified to use a simple WithOrdinals value source rather than the deleted WithOrdinals.Parent.

Relates #20257
2017-05-19 17:11:23 +02:00
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