: A more nuanced answer would be to finesse the MM parameter so shorter : multi-word queries behave as AND, and longer queries allow more : flexibility (this could probably be achieved by using a high : percentage setting, but I'd have to double check how the rounding is : done).
you are correct, something like "5<90%" will say that in a query of up to 5 clauses, they are all required, but once you have 6 clauses, only 90% rounded down are required ... if you want the 90% to be "round up" use "3<-10%" (the percentages are allways "rounded down" but if it's negative, it's rounded down before the subtraction happens, so -10% is like rounding up 90%) if you want strict "AND" style matching with dismax, just use "100%" for mm. MinShouldMatch is one of the few things about DisMax that is extremely well documented... http://lucene.apache.org/solr/api/org/apache/solr/util/doc-files/min-should-match.html -Hoss
