fix: add plain handler #18857

Job	Run time
commit-lint	3m 6s
lint-flake-8	11s
check-black	2m 52s
build-wheels (ubuntu-latest, 3.7, cp37-cp37m)	1m 30s
build-wheels (ubuntu-latest, 3.8, cp38-cp38)	1m 29s
build-wheels (ubuntu-latest, 3.9, cp39-cp39)	1m 17s
check-docstring	2m 57s
build-wheels (ubuntu-latest, 3.10, cp310-cp310)	1m 19s
build-wheels (ubuntu-latest, 3.11, cp311-cp311)	1m 23s
build-wheels (macos-latest, 3.8, 38, macosx_x86_64, x86_64, amd64)	1m 52s
code-injection	1m 5s
build-wheels (macos-latest, 3.9, 39, macosx_x86_64, x86_64, amd64)	1m 23s
build-wheels (macos-latest, 3.10, 310, macosx_x86_64, x86_64, amd64)	1m 25s
build-wheels (macos-latest, 3.11, 311, macosx_x86_64, x86_64, amd64)	1m 23s
build-wheels (macos-latest, 3.8, 38, macosx_arm64, arm64, arm64)	1m 40s
build-wheels (macos-latest, 3.9, 39, macosx_arm64, arm64, arm64)	1m 18s
build-wheels (macos-latest, 3.10, 310, macosx_arm64, arm64, arm64)	1m 12s
build-wheels (macos-latest, 3.11, 311, macosx_arm64, arm64, arm64)	1m 10s
k8s-flow-test	0s
k8s-deployment-test	0s
docker-image-test	0s
hub-test	0s
docker-compose-test	0s
import-test	0s
install-jina-ecosystem-test	0s
k8s-failures-test	0s
k8s-graceful-test	0s
k8s-otel-test	0s
prep-testbed	0s
core-test	0s
stateful-docarray-v-two-test	0s
docarray-v-two-test	0s
success-all-test	4s
	28m 36s

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