OpenSearch 3 in Adobe Commerce: what Adobe requires and when
OpenSearch 2.x does not meet the requirement for Adobe Commerce 2.4.6+; Adobe's stated enforcement date is 31 May 2027.
The requirement affects teams running 2.4.6 or later. OpenSearch 3 belongs in the compatibility plan alongside PHP, database, cache, messaging and custom modules.
On the Pro plan, changing only .magento.app.yaml is not enough in Production. A service ticket with Adobe Infrastructure is required.