If you want the best possible solution vertical for most business, I'd be looking at using Lucene for FTS duty. Having the FTS engine provide a google-style sn

If you want the best possible solution vertical for most business, I'd be looking at using Lucene for FTS duty. Having the FTS engine provide a google-style snippet of the most relevant document chunk is the holy grail for RAG applications. Lucene does this kind of thing better than anyone else: https://lucene.apache.org/core/8_0_0/highlighter/org/apache/lucene/search/highlight/Highlighter.html https://lucene.apache.org/core/8_0_0/highlighter/org/apache/... It is also very easy to customize this engine and align the document tokenization & indexing concerns with your specific retrieval scenarios.