问题
Does Lucene provide a means to boost fresh documents?
For example suppose that the Lucene document includes a date field. Is it possible, without having the user to alter her query anyhow, to present the most recent documents with a higher score?
I do not want to resort to a coarse "sort by date" solution as it will completely cancel the scoring algorithm.
回答1:
Use Document.setBoost(float value) when putting documents into the index.
You can either constantly re-adjust the value on existing documents, OR have a float value that increments with date, so that you only need to apply it to the time that documents are inserted.
For example, start with a boost value of 0 for day 1 documents. Each day, increment the boost by 1. It's a float value, incrementing by 365 each year will last a long time.
You may have to experiment with the strength of the boost to get the effect you want.
回答2:
You can see Lucene in Action. In the second edition, pg. 187 they give a way to do it. Basically, you will want to write your own query which extends CustomScoreQuery, and adds a boost.
来源：https://stackoverflow.com/questions/4724451/boost-fresh-documents-with-lucene