TermsAggregationExecutionHint
Determines how the terms aggregation is executed
GlobalOrdinals = 1
Order by using ordinals of the field and preemptively allocating one bucket per ordinal value
Order by using ordinals of the field and dynamically allocating one bucket per ordinal value
Order by using per-segment ordinals to compute counts and remap these counts to global counts using global ordinals
Map = 0
Order by using field values directly in order to aggregate data per-bucket