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The question says that the data after 1 week is classified as “infrequently accessed”. After 3 months the index is deleted altogether and no longer needs to be found in OpenSearch – just that the data needs to be stored in an archive somewhere. Therefore Glacier Deep Archive is a valid (and correct for MOST cost-effective) answer. Data in OpenSearch cold storage will experience a slight delay in query responses but per the question, that’s okay for data older than 1 week.
