Multi-word synonym filter (synonym expansion at indexing time).
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Key: LUCENE-1622
URL: https://issues.apache.org/jira/browse/LUCENE-1622
Project: Lucene - Java
Issue Type: New Feature
Components: contrib/*
Reporter: Dawid Weiss
Priority: Minor
Attachments: synonyms.patch
It would be useful to have a filter that provides support for indexing-time
synonym expansion, especially for multi-word synonyms (with multi-word matching
for original tokens).
The problem is not trivial, as observed on the mailing list. The problems I was
able to identify (mentioned in the unit tests as well):
- if multi-word synonyms are indexed together with the original token stream
(at overlapping positions), then a query for a partial synonym sequence (e.g.,
"big" in the synonym "big apple" for "new york city") causes the document to
match;
- there are problems with highlighting the original document when synonym is
matched (see unit tests for an example),
- if the synonym is of different length than the original sequence of tokens to
be matched, then phrase queries spanning the synonym and the original sequence
boundary won't be found. Example "big apple" synonym for "new york city". A
phrase query "big apple restaurants" won't match "new york city restaurants".
I am posting the patch that implements phrase synonyms as a token filter. This
is not necessarily intended for immediate inclusion, but may provide a basis
for many people to experiment and adjust to their own scenarios.
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