Weaviate BM25 returns no results in some situations (inverted index bug, fixed in #3592)
This was a real inverted-index bug that only surfaced in v1.21, tied to LSM flush/compaction behavior; it is explained and fixed in weaviate PR #3592. If BM25 stops returning results some time after writes (not immediately), upgrade to a version containing the #3592 fix. Source:
Problem outcome: unknown