De los documentos.
Puede pasar batchSize
con AggregationOptions
en la versión Spring Mongo 2.x
Aggregation aggregation = newAggregation(unwind, group).withOptions(newAggregationOptions().cursorBatchSize(100).build());
Con tamaño de lote predeterminado
Aggregation aggregation = newAggregation(unwind, group).withOptions(newAggregationOptions().cursor(new Document()).build());