Implementation ranking by using a Lucene search

Question

I want to do ranking in Lucene search but I couldn't. I implemented Lucene in Java and the code indexing files and searching in indexed files. But I want to evaluate and make ranking function which returns double between 0 to 1. How can I implement this function. Thanks a lot!

Answer 1

Lucene uses TF-IDF similarity algorithm which you can override.

Alternatively, you can use boosting - either when indexing or querying. This is much simpler approach and requires less effort.