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type Config struct {
	// Retriever specifies the original retriever used to retrieve documents.
	// For example: a vector database retriever like Milvus, or a full-text search retriever like Elasticsearch.
	Retriever retriever.Retriever
	// ParentIDKey specifies the key used in the sub-document metadata to store the parent document ID.
	// Documents without this key will be removed from the recall results.
	// For example: if ParentIDKey is "parent_id", it will look for metadata like:
	// {"parent_id": "original_doc_123"}
	ParentIDKey string
	// OrigDocGetter specifies the method for getting original documents by ids from the sub-document metadata.
	// Parameters:
	//   - ctx: context for the operation
	//   - ids: slice of parent document IDs to retrieve
	// Returns:
	//   - []*schema.Document: slice of retrieved parent documents
	//   - error: any error encountered during retrieval
	//
	// For example: if sub-documents with parent IDs ["doc_1", "doc_2"] are retrieved,
	// OrigDocGetter will be called to fetch the original documents with these IDs.
	OrigDocGetter func(ctx context.Context, ids []string) ([]*schema.Document, error)
}