Remove reference to default credentials #529

Job	Run time
test-opensearch-faraday-1 (2.6)	2m 14s
test-opensearch-faraday-1 (2.7)	2m 9s
test-opensearch (2.5)	2m 15s
test-opensearch-faraday-1 (3.0)	2m 52s
test-opensearch (2.6)	2m 20s
test-opensearch-faraday-1 (3.1)	1m 52s
test-opensearch (2.7)	2m 15s
test-opensearch-faraday-1 (3.2)	1m 46s
test-opensearch (3.0)	2m 6s
test-opensearch-faraday-1 (3.3)	1m 54s
test-opensearch (3.1)	2m 2s
test-opensearch-faraday-1 (jruby-9.3)	2m 16s
test-opensearch (3.2)	2m 0s
test-opensearch (3.3)	1m 57s
test-opensearch-security (2.5)	2m 21s
test-opensearch (jruby-9.3)	2m 55s
test-opensearch-security (2.6)	2m 28s
test-opensearch-security (2.7)	4m 1s
test-opensearch-security (3.0)	1m 56s
test-opensearch-security (3.1)	2m 7s
test-opensearch-security (3.2)	1m 50s
test-opensearch-security (3.3)	1m 52s
test-opensearch-security (jruby-9.3)	1m 41s
	51m 9s

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