Bedrock DELETE_UNSUCCESSFUL — the knowledge base needs its OpenSearch collection to delete
Two Amazon Bedrock knowledge bases stuck at DELETE_UNSUCCESSFUL after their OpenSearch Serverless collections were deleted first, and the RETAIN fix.
RAG
RAG vs fine-tuning for KB search — what fine-tuning actually learns, and when pure IR wins
Whether fine-tuning can replace RAG for knowledge base search: what fine-tuning actually learns, when pure IR or long context wins, and what each costs.