RATIS-2507. Fix java.lang.IllegalStateException: gap between entries #738

Job	Run time
CI / build / build	1m 40s
CI / release / release	5m 33s
CI / unit (misc) / unit (misc)	11m 10s
CI / unit (flaky) / unit (flaky)	3m 34s
CI / basic (findbugs) / findbugs	2m 6s
CI / unit (grpc) / unit (grpc)	18m 33s
CI / basic (checkstyle) / checkstyle	32s
CI / unit (server) / unit (server)	16m 32s
CI / basic (author) / author	10s
CI / basic (rat) / rat	17s
CI / repro / repro	1m 36s
CI / compile (8) / compile (8)	50s
CI / compile (11) / compile (11)	1m 7s
CI / compile (21) / compile (21)	1m 2s
CI / compile (17) / compile (17)	1m 8s
CI / coverage	0s
	1h 5m 50s

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