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Both engines now diff the stored/live index schema against the schema generated from code when the service starts. A shared recursive classifier in the mapping package is the single oracle: - equal: start normally. - additive (new fields without any indexed data): applied in place. OpenSearch gets a PUT _mapping with the full code properties, bleve persists the code mapping into the index (SetInternal + reopen) so the new fields are properly typed immediately and later startups classify equal. A startup warning lists the new fields because documents indexed before the upgrade lack them until re-indexed. - breaking (changed definitions or analyzers, removed or renamed fields, or new fields that already contain data of unknown form): refuse to start with an error describing the rebuild procedure (delete the index, start, run "opencloud search index --all-spaces") and the OC_EXCLUDE_RUN_SERVICES=search escape hatch. PUT _mapping is deliberately only the apply mechanism, never the judge: its merge semantics cannot see removals or renames and it accepts in-place updatable param changes with an ack. bleve additionally checks idx.Fields() so previously dynamically indexed data (which leaves no schema trace in bleve) is caught, matching by exact name and by path prefix. While at it: the OpenSearch startup check runs with a real, minute-bounded context instead of context.TODO(), bleve indexes are opened with a 5s bolt_timeout so a second process fails fast instead of hanging on the file lock, and the reversed errors.Is arguments in bleve.NewIndex were fixed. https://github.com/opencloud-eu/opencloud/issues/3092