Principal engineering guide to OpenSearch internals (Apache Lucene segments, FSTs, DocValues, Segment Replication, ISM tiers) and end-to-end Splunk-to-OpenSearch migration (Schema-on-Read vs Schema-on-Write, SPL to PPL/DSL translation, Data Prepper pipelines, and capacity math).
Principal engineering guide to OpenSearch schema design (nested vs flat_object, keyword vs numeric IDs), zero-downtime Alias + sliced _reindex migrations, high-throughput Java 21 BulkIngester, multi-tenant shard _routing, and Day-2 operational runbooks.
Principal engineering guideline on writing fast, memory-safe OpenSearch queries: Query vs Filter Context (Roaring Bitmap caches), Point-in-Time (PIT) + search_after deep pagination, high-cardinality aggregations, and Hybrid BM25 + k-NN Vector Search.
