使用 Lucene 提升新文档
Lucene 是否提供了一种增加新文档的方法?
Does Lucene provide a means to boost fresh documents?
例如，假设 Lucene 文档包含一个日期字段.是否有可能在不让用户改变她的查询的情况下，以更高的分数呈现最新的文档?
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?
我不想采用粗略的按日期排序"解决方案，因为它会完全取消评分算法.
I do not want to resort to a coarse "sort by date" solution as it will completely cancel the scoring algorithm.
推荐答案
将文档放入索引时使用 Document.setBoost(float value).
Use Document.setBoost(float value) when putting documents into the index.
您可以不断地重新调整现有文档上的值，或者拥有一个随日期递增的浮点值，这样您只需将其应用于插入文档的时间.
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.
例如，从第 1 天文档的提升值 0 开始.每天，boost 递增 1.它是一个浮点值，每年递增 365 会持续很长时间.
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.
您可能需要尝试增强的强度才能获得您想要的效果.
You may have to experiment with the strength of the boost to get the effect you want.
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