Amazon OpenSearch Service introduces Derived Source
Amazon OpenSearch Service introduces Derived Source, a new feature that significantly reduces storage requirement. You can still dynamically derive the source when needed.
OpenSearch stores each ingested document in the _source field and also indexes individual fields for search. The _source field can consume significant storage space. To reduce storage use, you can configure OpenSearch to skip storing the _source field and instead reconstruct it dynamically when needed, for example, during search, get, mget, reindex, or update operations.
Derived Source is available in all regions where OpenSearch 3.1 is supported, including Amazon Web Services China (Beijing) region, operated by Sinnet, and Amazon Web Services China (Ningxia) region, operated by NWCD. The feature is opt-in and can be enabled at index creation using composite index settings.