Now, I'm wondering how do I encode the weight of keywords... If I do the following:
Field f = Field.Keyword("kw", "value1"); f.setBoost(10.0); doc.add(f); f = Field.Keyword("kw", "value2"); f.setBoost(20.0); doc.add(f);
Now the question is: what is the boost value for the fields when I search? Is it equivalent to "value1^10.0 value2^20.0" (which is my intention), or rather "value1^20.0 value2^20.0"?
I think the boost will be 200.0. Boosts are multiplicative.
If the latter, do you have any suggestions how to achieve the original effect?
The only way to do this is to repeat occurences of each word.
So you might:
for (int i = 0; i < 10; i++) {
doc.add(new Field("kw", "value1", false, true, false);
} for (int i = 0; i < 20; i++) {
doc.add(new Field("kw", "value1", false, true, false);
}You might also consider using a custom Similarity implementation so that you can control the interpretation of these frequencies. For example, you might, instead of 10 and 20, be able to just use 1 and 2 and then, in your Similarity.tf() implementation, turn this into whatever value you want used in the scoring.
Doug
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