bugfix: similarity search only works on default_group_slice #3404

Job	Run time
build / build	2m 22s
build / changes	23s
e2e / test-e2e	20m 0s
test / test-app	1m 1s
test / test-python (ubuntu-latest-m, 3.8)	9m 49s
test / test-python (ubuntu-latest-m, 3.10)	10m 25s
all-tests	1s
	44m 1s

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