Haystack is an NLP framework for building open-domain question answering systems that harness the power of BERT and other Transformer-based language models with the speed of Elasticsearch distributed storage. It enables users to create end-to-end question answering pipelines with customizable modules, including DocumentStore, Retriever, and Reader. Haystack can be used to extend Elasticsearch capabilities by using its search functionality to process natural language queries. The system has been demonstrated using a GPU-enabled cloud compute instance and Docker, and it can return answers with high confidence levels when queried about relevant topics. However, it may struggle with questions that are outside of the training data or require more complex reasoning. Haystack is designed for speed and scalability, making it suitable for applications requiring fast search and retrieval capabilities.