Thomas,
It looks like you've set things up correctly in that while the user is
searching against a stemmed field ("name"), spellcheck is checking against a
lightly-analyzed copy of it ("spell"). This is the right way to do it as
spellcheck against stemmed forms is usually undesirable.
But as you've experienced, you will sometimes get results (due to stemming) and
also suggestions (because the spellechecker is looking at unstemmed forms). If
you do not want spellcheck to return anything when you get results, you can set
"spellcheck.maxResultsForSuggest=0".
Now keeping in mind we're comparing unstemmed forms, can you verify you indeed
have something in your index that is within 2 edits of "ichtscheiben" ? My
guess is you probably don't, which would be why you do not get spelling results
in that case.
Also, even if you do have something within 2 edits, if "ichtscheiben" occurs in
your index, by default it won't try to correct it at all (even if the query
returns nothing, maybe because of filters or other required terms on the
query). In this case you need to set "spellcheck.alternativeTermCount" to a
non-zero value (try maybe 5).
See
http://wiki.apache.org/solr/SpellCheckComponent#spellcheck.alternativeTermCount
and following sections.
James Dyer
Ingram Content Group
(615) 213-4311
-----Original Message-----
From: Thomas Michael Engelke [mailto:thomas.enge...@posteo.de]
Sent: Wednesday, September 10, 2014 5:00 AM
To: Solr user
Subject: Solr Spellcheck suggestions only return from /select handler when
returning search results
Hi,
I'm experimenting with the Spellcheck component and have therefor
used the example configuration for spell checking to try things out. My
solrconfig.xml looks like this:
<searchComponent name="spellcheck"
class="solr.SpellCheckComponent">
<str
name="queryAnalyzerFieldType">spell</str>
<!-- Multiple "Spell
Checkers" can be declared and used by this
component
-->
<!-- a
spellchecker built from a field of the main index -->
<lst
name="spellchecker">
<str name="name">default</str>
<str
name="field">spell</str>
<str
name="classname">solr.DirectSolrSpellChecker</str>
<!-- the spellcheck
distance measure used, the default is the internal levenshtein -->
<str
name="distanceMeasure">internal</str>
<!-- uncomment this to require
suggestions to occur in 1% of the documents
<float
name="thresholdTokenFrequency">.01</float>
-->
</lst>
<!-- a
spellchecker that can break or combine words. See "/spell" handler below
for usage -->
<lst name="spellchecker">
<str
name="name">wordbreak</str>
<str
name="classname">solr.WordBreakSolrSpellChecker</str>
<str
name="field">spell</str>
<str name="combineWords">true</str>
<str
name="breakWords">true</str>
<int name="maxChanges">10</int>
</lst>
</searchComponent>
And I've added the spellcheck component to my
/select request handler:
<requestHandler name="/select"
class="solr.SearchHandler">
...
<arr name="last-components">
<str>spellcheck</str>
</arr>
</requestHandler>
I have built up the
spellchecker source in the schema.xml from the name field:
<field
name="spell" type="spell" indexed="true" stored="true" required="false"
multiValued="false"/>
<copyField source="name" dest="spell"
maxChars="30000" />
...
<fieldType name="spell" class="solr.TextField"
positionIncrementGap="100">
<analyzer type="index">
<tokenizer
class="solr.StandardTokenizerFactory"/>
</analyzer>
<analyzer
type="query">
<tokenizer class="solr.StandardTokenizerFactory"/>
</analyzer>
</fieldType>
As I'm querying the /select request handler,
I should get spellcheck suggestions with my results. However, I rarely
get a suggestion. Examples:
query: Sichtscheibe, spellcheck suggestion:
Sichtscheiben (works)
query: Sichtscheib, spellcheck suggestion:
Sichtscheiben (works)
query: ichtscheiben, no spellcheck suggestions
As
far as I can identify, I only get suggestions when I get real search
results. I get results for the first 2 examples, because the german
StemFilterFactory translates "Sichtscheibe" and "Sichtscheiben" into
"Sichtscheib", so there are matches found. However, the third query
should result in a suggestion, as the Levenshtein distance is less than
in the second example.
Suggestions, improvements, corrections?
