[FLINK-33370][connectors/elasticsearch] Simplify validateAndParseHost… #171

Job	Run time
compile_and_test (1.17.1) / compile_and_test (8)	3m 34s
compile_and_test (1.18.0) / compile_and_test (8)	3m 35s
compile_and_test (1.18.0) / compile_and_test (11)	3m 30s
compile_and_test (1.17.1) / compile_and_test (11)	3m 31s
compile_and_test (1.19-SNAPSHOT) / compile_and_test (8)	2m 52s
compile_and_test (1.19-SNAPSHOT) / compile_and_test (11)	3m 13s
	20m 15s

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