Fixes `RestHelper` and `IndexTemplateClusterPermissionsCheckTest` for backport of #1885 : `opendistro-1.11`#2011

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rutuja-amazon wants to merge 1 commit intoopensearch-project:opendistro-1.11from rutuja-amazon:roll-fwd-1.11

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Commits on Aug 10, 2022

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