Fixed bugs in api_generator #649

Job	Run time
test-opensearch (3.0)	2m 14s
test-opensearch (3.1)	2m 21s
test-opensearch-faraday-1 (3.0)	1m 59s
test-opensearch (3.2)	2m 18s
test-opensearch-security (3.0)	2m 3s
test-opensearch-faraday-1 (3.4)	1m 59s
test-opensearch (3.3)	2m 22s
test-opensearch-faraday-1 (jruby-9.4)	2m 20s
test-opensearch-security (3.4)	1m 55s
test-opensearch-security (jruby-9.4)	1m 43s
test-opensearch (3.4)	2m 12s
test-opensearch (jruby-9.4)	3m 15s
	26m 41s

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