[v1.0] Remove 2 unused Maven plugins #5121

Job	Run time
build-all	3m 5s
tests (es, -Pelasticsearch8, es8-java8, 8)	29m 6s
tests (es, -Pelasticsearch7, es7-java8, 8)	28m 52s
tests (es, -Pelasticsearch6, es6-java8, 8)	27m 16s
tests (es, -Pelasticsearch60, es60-java8, 8)	27m 59s
tests (es, -Pjava-11, -Pelasticsearch8, es8, 11)	28m 50s
tests (es, -Pjava-11, -Pelasticsearch7, es7, 11)	27m 59s
tests (es, -Pjava-11, -Pelasticsearch6, es6, 11)	27m 32s
tests (es, -Pjava-11, -Pelasticsearch60, es60, 11)	27m 10s
	3h 47m 49s

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