Lucene 4 Cookbook

DisjunctionMaxQuery

This query type sounds a little funny and can be confusing at first. It's like a BooleanQuery that contains a number of subqueries. Instead of combining scores from each sub-Query, it returns the maximum score from one of the subqueries. The reason for this is that matching may match on multiple fields, and a match on more important fields (should have a higher score) can sometimes have an equivalent score with matching on less important fields due to the number of matching terms. For example, let's say we have a book store application, in which we have a book title and body in our index, and let's say we are searching for The Old Man and the Sea. A match on the title would return a very high score. However, it's possible that ...