It would be great if there was an option in the Elasticsearch configuration to boost results so that 'new' material appeared towards the top. I can imagine a library might want to do this based on three possible criteria: 1. items new to the collection could be boosted higher in the results list 2. items published more recently should be boosted higher in results e.g if two books share the same title, the more recent one should come higher in the results list 3. the latest edition of a book should be boosted higher than previous editions in results e.g. the 7th edition of "Learning Perl" should come higher than the first edition.