ESQL: Fix wrong marking of a field as unmapped when indices shared the same mapping#133298

GalLalouche merged 7 commits intoelastic:mainelastic/elasticsearch:mainfrom

GalLalouche:gall_bug/fix_insist_same_mapping_20250821GalLalouche/elasticsearch:gall_bug/fix_insist_same_mapping_20250821Copy head branch name to clipboard