RATIS-2507. Fix java.lang.IllegalStateException: gap between entries #737

Job	Run time
CI / release / release	5m 28s
CI / build / build	1m 43s
CI / basic (checkstyle) / checkstyle	30s
CI / basic (author) / author	12s
CI / unit (server) / unit (server)	16m 2s
CI / basic (findbugs) / findbugs	2m 41s
CI / unit (misc) / unit (misc)	12m 37s
CI / unit (grpc) / unit (grpc)	18m 21s
CI / basic (rat) / rat	20s
CI / unit (flaky) / unit (flaky)	4m 47s
CI / repro / repro	1m 34s
CI / compile (8) / compile (8)	48s
CI / compile (11) / compile (11)	1m 7s
CI / compile (17) / compile (17)	1m 15s
CI / compile (21) / compile (21)	59s
CI / coverage	0s
	1h 8m 24s

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