It's an opinionated blog post published on Arxiv, masquerading as research.
IMHO, it's a gigantic self-own and doesn’t promote Lucene in a good way. For example, by demonstrating how they get only 10 QPS out of a system with 1TB of memory and 96 v-cpu's (after 4 warmups).
The HNSW implementation in Lucene is fair, and within the same order of magnitude as others. But, to get comparable performance, you must merge all immutable segments to a single segment, which all Lucene oriented benchmark does, but which is not that realistic for many production workloads where docs are updated/added in near real-time.
IMHO, it's a gigantic self-own and doesn’t promote Lucene in a good way. For example, by demonstrating how they get only 10 QPS out of a system with 1TB of memory and 96 v-cpu's (after 4 warmups).
The HNSW implementation in Lucene is fair, and within the same order of magnitude as others. But, to get comparable performance, you must merge all immutable segments to a single segment, which all Lucene oriented benchmark does, but which is not that realistic for many production workloads where docs are updated/added in near real-time.