Document boosting in Hibernate Search / Lucene

Everything else remaining the same, some o开发者_开发知识库f my objects are more valuable than others.

Is it possible to boost objects at index time, let's say according to the USD price?

Or if you have a limited number of values, I was hoping that this would work:

f:aaa^4 f:bbb^3 f:ccc^2 animal:elephant

but I must be missing something.

---

What you are saying will work. However, you will probably want to reformat it as (boost query) +(original query), e.g. (f:a^4 f:b^3 b:c^2) +animal:elephant. The way you have it now will find things which only have f:aaa, regardless of animal:elephant.

You can see Lucene in Action for an example of how to write a custom scorer which allows you to do somethign more like boosting according to price. I'm not aware of any way you can do this without writing some code though.

---

If you are using hibernate-search, you can add boosting directly to fields using annotation. There are two type of boost: dynamic boost which apply to the whole object, or field level boost. You probably want dynamic boost, and can be specified using: @DynamicBoost(impl = VIPBoostStrategy.class)

See http://docs.jboss.org/hibernate/search/3.2/reference/en-US/html/search-mapping.html#section-boost-annotation