[8.x] [TEST] Replace _source.mode with index.mapping.source.mode in integration tests (#115926)#116064

kkrik-es wants to merge 1 commit intoelastic:8.xelastic/elasticsearch:8.xfrom

kkrik-es:backport/8.x/pr-115926kkrik-es/elasticsearch:backport/8.x/pr-115926Copy head branch name to clipboard