Method ExecuteAggregateBatchAsync(long, IEnumerable<AggregateRequest>, string?)
⚡ Pro Override: Batch aggregation with filterJson (legacy).
Note: filterJson is ignored - use FilterExpression overload.
public override Task<AggregateResult> ExecuteAggregateBatchAsync(long schemeId, IEnumerable<AggregateRequest> requests, string? filterJson = null)