Artem, Here's a description of the change made to allow for customizing the length norm when indexing synonyms. I do not have a patch available for it at this time. While I made the change for 2.4 the same approach could be taken in 2.9 however there may a better of implementing it using Attributes however I have not yet investigated this approach.
I added an bool property to Token named 'IncludeInFieldLength' that defaulted to true, then in a custom analyzer if I did not want a Token to count towards the field length I would set the value to false. Within the DocInverterPerField class I altered the internals of processFields(Fieldable[] fields, int count) to only increment the value of fieldState.length if the 'IncludeInFieldLength' property on the token is set to true. I made the change to handle the same use case you have - synonym injection - and it worked great. Michael -----Original Message----- From: Artem Chereisky [mailto:a.cherei...@gmail.com] Sent: Wednesday, December 16, 2009 5:30 PM To: lucene-net-user@incubator.apache.org Subject: synonyms Hi Everyone, I implemented synonyms using SynonymFilter and SynonymTree classes which I ported from Java. The solution supports multi-word synonyms and it seems to work fine. One problem with this approach is, although synonyms are at the same position in the index, each gets counted towards the total number of terms. That adversely affects lengthNorm. Michael Garski mentioned earlier that he came across a similar issue and solved it. Am I correct Michael. If so, could you share your approach, please? Synonyms is a fairly standard feature. Is there a 'best practice' solution? Regards, Art
