OpenSearch ISM: Automate Index Rollover
Log indexes grow until a data node runs out of disk. How OpenSearch ISM rolls indexes over by size, ages them through hot and warm, then deletes on schedule.
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Reciprocal Rank Fusion for Hybrid Search
Reciprocal Rank Fusion merges two ranked lists without tuning score weights. The RRF formula, why the k constant matters, and how to run it in OpenSearch.
Metadata Filtering in RAG Vector Search
Post-filtering vector search silently drops good results. Here is pre-filter vs filtered ANN for RAG, why filtered HNSW is hard, and how to choose.
Zero-Downtime Reindexing in OpenSearch
Change an OpenSearch mapping without dropping writes or serving stale data. A step-by-step reindex with aliases, the Reindex API, and the failure modes.
Hybrid Search for RAG: BM25 + Vectors
Vector search alone misses exact IDs and error codes. Here's how to combine BM25 keyword search with dense retrieval, fuse the rankings with RRF, and rerank.
OpenSearch Dashboards for Workflow Monitoring
Build an OpenSearch dashboard that watches a job pipeline: structured logs, an index mapping, the queries behind each panel, and alerts that fire early.