Vespa is a fully featured search engine and vector database. Integration with LangChain4j uses: - Vespa's client & vespa-feed-client libraries which have Apache License 2.0: https://github.com/vespa-engine/vespa/blob/master/LICENSE - org.apache.httpcomponents.client5.httpclient5-fluent library which has Apache License 2.0: https://github.com/apache/httpcomponents-client/blob/master/LICENSE.txt