Does Opensolr integrate with Haystack?

Yes. Opensolr plugs into Haystack pipelines as a DocumentStore with a hybrid retriever:

pip install opensolr-haystack

A normal Haystack pipeline needs two embedder components — one for documents, one for queries. With OpensolrDocumentStore it needs none: everything embeds server-side on our GPU infrastructure, and OpensolrHybridRetriever fuses BM25 + kNN scores natively on managed Apache Solr 9. The full DocumentStore protocol is supported — duplicate policies, standard filters, Secret-based credentials, and serialization for saved pipelines.

Learn more: Haystack integration page · PyPI package · Source on GitHub