Really thanks for the quick reply, I want to find documents similar to one document (let's call it document A) in my index. To do this I use the MoreLikeThis class to help create query from document A. I also included document A in my index, so I assumed that I will have document A at the first rank. When I do the searching, I print out the top 10 documents along with their score. As I assumed before, I have document A in the first rank, but the score is above 1 (score=1.841656).
I think lucene score have range [0..1] because it uses cosine similarity, where score 1 means that two documents are perfectly similar and 0 means that there are no similarity between two document, but why I get document score above 1? Thanks, -Clara