Mike Lissner created SOLR-10102:
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Summary: SynonymFilterFactory in example file is on query not index
Key: SOLR-10102
URL: https://issues.apache.org/jira/browse/SOLR-10102
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Components: examples
Affects Versions: 6.4.1, 4.10.2
Reporter: Mike Lissner
The example files for both 4.10.2 and 6.4.1 have entries like these:
{code:xml}
<fieldType name="text_general" class="solr.TextField"
positionIncrementGap="100" multiValued="true">
<analyzer type="index">
<tokenizer class="solr.StandardTokenizerFactory"/>
<filter class="solr.StopFilterFactory" words="stopwords.txt"
ignoreCase="true"/>
<filter class="solr.LowerCaseFilterFactory"/>
</analyzer>
<analyzer type="query">
<tokenizer class="solr.StandardTokenizerFactory"/>
<filter class="solr.StopFilterFactory" words="stopwords.txt"
ignoreCase="true"/>
<!-- THIS IS WRONG, RIGHT? -->
<filter class="solr.SynonymFilterFactory" expand="true" ignoreCase="true"
synonyms="synonyms.txt"/>
<filter class="solr.LowerCaseFilterFactory"/>
</analyzer>
</fieldType>
{code}
You'll note that the synonym filter is applied at query time, which will
totally fail. Even [the
docs|https://wiki.apache.org/solr/AnalyzersTokenizersTokenFilters#solr.SynonymFilterFactory]
say:
bq. The recommended approach for dealing with synonyms like this, is to expand
the synonym when indexing.
Can we fix this? Or is there a reason why this is like this? As I understand
it, having synonyms on the query means that things just won't be returned that
should be.
For example, we have the token "5" set up with a synonym to the word "five".
So, if somebody searches for 5, the query filter will expand it to "5 AND
five", which, sure enough, the index doesn't match....no results. So...instead
of expanding the result set, like synonyms are supposed to do, this actively
contracts it.
I hope my frustration in this is misplaced, but if I'm right about this bug,
can I say that this is the kind of thing that makes Solr super frustrating to
use?
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