docs: add required field documentation on management api #9378

Job	Run time
API-Tests	10m 52s
Component-Tests	17m 34s
Checkstyle	5m 22s
End-To-End-Tests	16m 49s
Javadoc	7m 11s
Kafka-Integration-Tests	4m 59s
Postgresql-Integration-Tests	11m 21s
Unit-Tests	22m 46s
Upload-Test-Report	41s
Upload-Coverage-Report-To-Codecov	39s
	1h 38m 14s

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