Query-Expansion

• Synonym Expansion

  Query expansion using a configured synonym map, automatically retrieving documents with synonymous terms. Improves recall at query time.

• DocT5Query

  Document expansion via T5 query generation; generates synthetic queries a document might answer and appends them to the document before indexing, improving sparse retrieval recall.

• HyDE

  Hypothetical Document Embeddings; generates a hypothetical answer to a query using an LLM and embeds that instead of the original query for zero-shot dense retrieval improvement.

• Query2Doc

  Expands queries by prepending LLM-generated pseudo-documents before retrieval; improves both sparse and dense retrieval without modifying the index or retrieval model.