Fixes `RestHelper` and `IndexTemplateCluster` test for backport #1885: `opendistro-1.12`#2013

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rutuja-amazon wants to merge 1 commit intoopensearch-project:opendistro-1.12from rutuja-amazon:rollfwd-1.12

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Commits on Aug 10, 2022

fix resthelper and indextemplatecluster test for backport opensearch-project#1885
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