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From Erik Hatcher <>
Subject Re: More Like This boost
Date Tue, 22 Apr 2008 14:46:14 GMT
No, the MLT feature does not have that kind of field-specific  
boosting capability.  It sounds like it could be a useful enhancement  
though.  Of course you do get boosts for "interesting terms" already,  
but maybe having an additional field-specific boost would be a nice  
touch too.


On Apr 22, 2008, at 9:13 AM, Francisco Sanmartin wrote:
> I know that only one query of that type does not change anything.  
> But when it's two or more with different boosts, i hope it does.  
> Here is the situation:
> My docs have "Title" and "Description". What I want to do is to  
> give more relevancy to the morelikethis on the title than on the  
> description. So the query would be like this:
> query = (words^0.4 in^0.3 the^0.56 title^0.65)^0.70 (words^0.7  
> in^0.33 the^0.49 description^0.43)^0.30
> This way, the words in the title are more relevant than the words  
> in the description, right?
> Thanks!
> Pako
> Erik Hatcher wrote:
>> On Apr 21, 2008, at 5:02 PM, Francisco Sanmartin wrote:
>>> Is it possible to boost the query that MoreLikeThis returns  
>>> before sending it to Solr? I mean, technically is possible,  
>>> because you can add a factor to the whole query but...does it  
>>> make sense? (Remember that MoreLikeThis can already boosts each  
>>> term inside the query).
>>> For example, this could be a result of MoreLikeThis (with native  
>>> boosting enabled)
>>> queryResultMLT = (this^0.4 is^0.5 a^0.6 query^0.33 of^0.29  
>>> morelikethis^0.67)
>>> what I want to do is
>>> queryResulltMLT = (this^0.4 is^0.5 a^0.6 query^0.33 of^0.29  
>>> morelikethis^0.67)^0.60      <---(notice the boost of 0.60 for  
>>> the whole query)
>> That last boost wouldn't change the doc ordering at all, so it'd  
>> be kinda useless.
>> What are you trying to accomplish?
>>     Erik

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