Server-issued aggregationFilterToken on buckets, consumed verbatim via searchRequest.aggregationFilters. The graph layer decodes a filter into its buckets (a term, a range, or an or(...) of them), the proto carries them as AggregationFilter, and the engines match them natively: a key as the exact value of the field, a range from-inclusive and to-exclusive, so a drilldown returns exactly the matches the bucket counted. Filters are validated like aggregations, in both layers. Range tokens use the MS Graph spelling (range(min, 1980), range(2010, max, to="le")). AGG-22 to AGG-33, 36, 38 and 45 in the parity suite.
Dominik Schmidt
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