fixup! [FLINK-3992][core] Do not implement deprecated Key interface #138

Job	Run time
Default (Java 8) / Compile	35m 35s
Pre-compile Checks / Basic QA	14m 30s
Default (Java 8) / E2E (group 1)	1h 35m 52s
Default (Java 8) / Test packaging/licensing	34m 28s
Default (Java 8) / E2E (group 2)	1h 58m 20s
Default (Java 8) / Test (module: core)	13m 12s
Default (Java 8) / Test (module: python)	30m 20s
Default (Java 8) / Test (module: table)	32m 13s
Default (Java 8) / Test (module: connect)	19m 29s
Default (Java 8) / Test (module: tests)	37m 34s
Default (Java 8) / Test (module: misc)	45m 19s
	7h 56m 52s

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