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https://issues.apache.org/jira/browse/LUCENE-1622?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12870633#action_12870633
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Robert Muir commented on LUCENE-1622:
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{quote}
We'd then need an AutomatonWordQuery - the same idea as
AutomatonQuery, except at the word level not at the character level.
{quote}
This is a cool idea, and on the analysis side a word-level automaton is really
the datastructure I think we want for actually doing the multi-word synonym
match efficiently (with minimal lookahead etc)
> Multi-word synonym filter (synonym expansion at indexing time).
> ---------------------------------------------------------------
>
> Key: LUCENE-1622
> URL: https://issues.apache.org/jira/browse/LUCENE-1622
> Project: Lucene - Java
> Issue Type: New Feature
> Components: contrib/analyzers
> 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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