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From: Erik Hatcher <erik@ehatchersolutions.com>
Subject: Re: Boosting Fields (in index) or Queries
Date: Thu, 13 Apr 2006 20:17:59 -0400
To: java-user@lucene.apache.org

The best recommendation is to have a look at the Explanation returned  
from IndexSearcher.explain() for a specific query and document to  
trace how things are being scored.  Is it possible you're boosting  
all documents by the same amount?

	Erik


On Apr 13, 2006, at 6:29 PM, Jeremy Hanna wrote:

> I have a situation where I'm indexing database entries and have  
> fields such as:
>
> name
> sku
> model
> category name
> description
> features
> specifications
>
> I am trying to set a priority higher for the name, category name,  
> and description.
>
> I've tried setting the fields' boost values as I've indexed the db  
> and it seemed to have little or no result.
>
> When I tried to do the queries, I started using the  
> MultiFieldQueryParser but found that those don't have priority or  
> boost values you can set on any of the Fields at query time.  Then  
> I tried to have separate query parsers - one for each field.  That  
> way I could set a boost level for each of the queries created by  
> those query parsers.  I joined them together with a BooleanQuery  
> and all of them set to BooleanQuery.Occur.SHOULD.  I ended up  
> setting the features, specifications, and description to default to  
> Query.Operator.AND and that helped, but the boost value seems to do  
> nothing.
>
> I try to set the categoryParser's query boost to 4.0f, then 8.0f,  
> then 20.0f and have tried downgrading other queries, but the  
> results don't change at all in their order.
>
> I am using 1.9.1 and for my database I'm using hibernate to mysql 5  
> and ArrayLists with the bag mapping in hibernate.
>
> Does anyone have any thoughts or suggestions?
>
> Thanks!
>
> Jeremy
>
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