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https://www.elastic.co/guide/en/elasticsearch/reference/current/vector-queries.html

Vector queries [vector-queries]

Vector queries are specialized queries that work on vector fields to efficiently perform semantic search.

knn query: A query that finds the k nearest vectors to a query vector for dense_vector fields, as measured by a similarity metric.
sparse_vector query: A query used to search sparse_vector field types.
semantic query: A query that allows you to perform semantic search on semantic_text fields.

Deprecated vector queries [_deprecated_vector_queries]

The following queries have been deprecated and will be removed in the near future. Use the sparse_vector query query instead.

text_expansion query: A query that allows you to perform sparse vector search on sparse_vector or rank_features fields.
weighted_tokens query: Allows to perform text expansion queries optimizing for performance.