Amazon OpenSearch Service announces Derived Source for storage optimization

Amazon OpenSearch Service introduces support for Derived Source, a new feature that can help reduce the amount of storage required for your OpenSearch Service domains. With derived source support, you can skip storing source fields and dynamically derive them when required. 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. The feature is opt-in and can be enabled at index creation using composite index settings. Please refer to the AWS Regional Services List for more information about Amazon OpenSearch Service availability. To learn more about Derived Source, see the [OpenSearch documentation](https://docs.opensearch.org/latest/field-types/metadata-fields/source/#derived-source).