It would be hilarious if Lucene did pull in an entire database as a transitive dependency. But sadly that's not the case:

https://github.com/search?q=repo%3Aapache%2Flucene%20pinecon...

Lucene has its own HNSW implementation…

… actually through codecs Lucene has a whatever-you-want-to-build implementation

Lucene is a java library. No way they are using Pinecone.