As I read about Filters, it seems to me that a filter is preferred for any portion of the query string where you are setting the boost to 0 (meaning you don't want it to contribute to the relevancy score).
But, relevancy is only interesting if you are displaying the documents in relevancy order. Is it too simplistic to say that if you are displaying results in some order other than relevancy (e.g., in date order), that you should simply use filters and ignore queries (use MatchAllDocsQuery)?
