technotes · topic

Elasticsearch

Depth for interview readiness & durable competence — relevance, internals, performance, Query DSL.

MissionResourcesGlossary

Lessons

1. 0001 Query context vs Filter context

   The scored/unscored split — a relevance and performance decision.

   done
2. 0002 BM25 scoring: TF saturation & length normalization

   How _score is actually computed — three intuitions, one formula, two knobs.

   done
3. 0003 Analysis pipeline & the term-mismatch trap

   Analyzers, index vs. search time, why queries silently miss.

   done
4. 0004 Inverted index internals

   Term dictionary, postings lists, and why term lookup is fast.

   planned

Reference