Respect `size` parameter in aggregations (1/3 - refactor) #811

Job	Run time
build-log-generator (log-generator)	11s
quesma-test-and-compile (quesma)	2m 2s
build-quesma-docker-image (quesma)	1m 6s
smoke-test	2m 27s
	5m 46s

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