OpenSearch Schema/Mapping Review (Schema Review)

The grounding principles are in reference/principles.md. For facts, prefer reference/kb/ (the official docs).

Review order (proceed in this order)

1. What index does this index? — Identify the domain, language (Korean?), time-series nature, and scale (N).
2. Mapping in general — Check the review hooks in reference/kb/field-types.md · reference/kb/dynamic-mapping-risks.md.
3. Analyzers — Check reference/kb/analyzers-tokenizers.md (search vs index analyzer, normalizer, nori). If the nori grep returns 0 hits, state "not applicable".
4. Vector fields — Check reference/kb/knn-vector-field.md (dimension/space_type/engine/mode consistency, immutability).
5. Templates — reference/kb/index-templates.md. Along with the severity, provide a fix (mapping JSON diff) + a zero-downtime reindex/alias strategy.

Quick checklist

• Is dynamic set to strict/false on production indexes (to prevent mapping explosion)?
• Is sorting/aggregation/exact on keyword and full-text search on text? Are unused fields index:false/doc_values:false?
• Does the knn_vector dimension match the model output, and is the space_type consistent with normalization?
• Is the engine faiss/lucene (migrate if nmslib)? Are the core fields explicit in the mapping (to prevent dynamic inference)?
• Are large vectors duplicated in _source → derived source (beware that nested/copy_to are unsupported)?
• (Korean) Is nori configured with decompound_mode, a user dictionary, parts of speech, and a search-time synonym_graph?

KB (read and cite first)

From reference/kb/INDEX.md, read the following, check against the "review hooks", and cite via the source URL:

• reference/kb/field-types.md · reference/kb/analyzers-tokenizers.md · reference/kb/knn-vector-field.md · reference/kb/index-templates.md · reference/kb/dynamic-mapping-risks.md

Deliverable

For each finding: problem → violated principle (principles.md §)/KB source → mapping diff → verification (_mapping/_analyze). Because mappings are immutable, accompany any change with a zero-downtime reindex/alias strategy.