same 30,000 documents, same queries; only the dense_vector index_options.type differs (the first row is Spring AI's own mapping)
type          recall@10    p50 ms  filt recall    filt p50 ms
bbq_hnsw*         0.472       3.1        0.550            3.0
int8_hnsw         0.967       3.6        0.969            3.2
hnsw              0.997       3.5        1.000            2.9
* default; its full mapping is in 04-defaults-that-matter.txt