Update AUTHORS and CONTRIBUTORS #5473

Job	Run time
build-all	3m 16s
tests (es, -Pelasticsearch8, es8-java8, 8)	39s
tests (es, -Pelasticsearch7, es7-java8, 8)	30m 34s
tests (es, -Pelasticsearch6, es6-java8, 8)	37s
tests (es, -Pelasticsearch60, es60-java8, 8)	29m 21s
tests (es, -Pjava-11, -Pelasticsearch8, es8, 11)	31m 23s
tests (es, -Pjava-11, -Pelasticsearch7, es7, 11)	30m 15s
tests (es, -Pjava-11, -Pelasticsearch6, es6, 11)	29m 30s
tests (es, -Pjava-11, -Pelasticsearch60, es60, 11)	29m 12s
	3h 4m 47s

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