feat: opensearch dedicated node roles#1395

wojcik-dorota wants to merge 3 commits intomainaiven/aiven-docs:mainfrom

MA-3783-docs-add-public-docs-for-aiven-for-open-search-dedicated-node-rolesaiven/aiven-docs:MA-3783-docs-add-public-docs-for-aiven-for-open-search-dedicated-node-rolesCopy head branch name to clipboard