OpenSearch query with filter

[ljy2855]

개요

OpenSearch k-NN search시, filtering 방식 정리

필터링 종류

Filter	When the filter is applied	Type of search	Supported engines and methods	Where to place the filter clause
Efficient k-NN filtering	During search (a hybrid of pre- and post-filtering)	Approximate	- lucene (hnsw)- faiss (hnsw, ivf)	Inside the k-NN query clause.
Boolean filter	After search (post-filtering)	Approximate	- lucene- nmslib- faiss	Outside the k-NN query clause. Must be a leaf clause.
The post_filter parameter	After search (post-filtering)	Approximate	- lucene- nmslib- faiss	Outside the k-NN query clause.
Scoring script filter	Before search (pre-filtering)	Exact	N/A	Inside the script score query clause.

레퍼런스

https://opensearch.org/docs/latest/search-plugins/knn/filter-search-knn/