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Autocomplete and Search-as-You-Type: edge_ngram, search_as_you_type and the Completion Suggester

Suggest-as-you-type in Elasticsearch needs a field that indexes word beginnings: edge_ngram, search_as_you_type or the completion suggester; for Bookstore we chose edge_ngram, which also suggests from middle words and can be filtered. With real output: "kür" finding Kürk Mantolu Madonna, analyzer order, the or trap of bool_prefix, mandatory completion contexts, field sizes with _disk_usage, and a /books/suggest endpoint with _source filtering, collapse and Output Cache.