May 08, 2026
Haystack is a battle-tested framework for building large-scale search systems. Its modular design allows developers to swap components easily, making it perfect for building custom RAG pipelines that need to integrate with specific vector databases or document stores.
In Haystack, everything is a component in a "Pipeline." This allows you to build complex logic—like branching based on document relevance or combining results from multiple search engines—using a clear and maintainable structure.
With deep integrations for Elasticsearch, OpenSearch, and Milvus, Haystack is built for high-performance, enterprise-scale applications. It handles document preprocessing, metadata filtering, and re-ranking out of the box, ensuring high-quality search results for any use case.