February 27, 2025
Filtered HNSW search, fast mode
Explore the improvements we have made for HNSW vector search in Apache Lucene through our ACORN-1 algorithm implementation.
February 7, 2025
Concurrency bugs in Lucene: How to fix optimistic concurrency failures
Thanks to Fray, a deterministic concurrency testing framework from CMU’s PASTA Lab, we tracked down a tricky Lucene bug and squashed it
January 7, 2025
Early termination in HNSW for faster approximate KNN search
Learn how HNSW can be made faster for KNN search, using smart early termination strategies.
January 6, 2025
Optimized Scalar Quantization: Even Better Binary Quantization
Here we explain optimized scalar quantization in Elasticsearch and how we used it to improve Better Binary Quantization (BBQ).
January 3, 2025
Lucene Wrapped 2024
2024 has been another major year for Apache Lucene. In this blog, we’ll explore the key highlights.
December 27, 2024
Lucene bug adventures: Fixing a corrupted index exception
Sometimes, a single line of code takes days to write. Here, we get a glimpse of an engineer's pain and debugging over multiple days to fix a potential Apache Lucene index corruption.
December 4, 2024
Smokin' fast BBQ with hardware accelerated SIMD instructions
How we optimized vector comparisons in BBQ with hardware accelerated SIMD (Single Instruction Multiple Data) instructions.
November 18, 2024
Better Binary Quantization (BBQ) vs. Product Quantization
Why we chose to spend time working on Better Binary Quantization (BBQ) instead of product quantization in Lucene and Elasticsearch.
November 11, 2024
Better Binary Quantization (BBQ) in Lucene and Elasticsearch
How Better Binary Quantization (BBQ) works in Lucene and Elasticsearch.