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Date: Wed, 11 Jun 2014 10:58:37 -0700 (MST)
From: Chris Hostetter <hossman_lucene@fucit.org>
To: java-user@lucene.apache.org
Subject: RE: will score get changed as document continuously added.
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: Yes the score will change, because the new documents change the 
: statistics. In general, scores cannot be seen as absolute numbers, they 
: are only useful to compare between search results of the exact same 
: query at the same index snapshot. They have no global meaning.

This wiki page goes into more depth (it focuses on a more specific 
question people frequently ask, but the core of the problem is the 
same as what you are asking about)...

https://wiki.apache.org/lucene-java/ScoresAsPercentages


-Hoss
http://www.lucidworks.com/

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