What are people using for low-latency autocomplete in production? [P]

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I’ve been looking into autocomplete/typeahead systems recently, especially in contexts where latency really matters (e.g. search-as-you-type or RAG pipelines). From what I can tell, the main approaches are: Full search backends (Elasticsearch, Meilisearch, etc.) LLM-based suggestions (flexible but slow per keystroke) Simpler prefix / n-gram systems (fast but sometimes limited) I’m trying to understand what people actually use in production when you need: very low latency reasonable suggestion...