Solr Spell Check - solr

Question

I am working with Solr Spell Check . Got it up and running . However for certain misspells it is not giving the expected result :
Correct Word : Cancer
Incorrect Spelling : Cacner ,cacnar , cancar ,cancre,cancere .
I am not getting "cancer" as the suggestion for "cacnar" instead it shows "inner" which although sounds more like cacner is not the correct suggestion . And for cacnar again I am getting a suggestion as 'pulmonary'.
Any way of configuring it to display cancer instead of the other results ?
Alternatively is there any score for the suggestions that can be referred to before showing it to the user ?
As per request here is the configuration :
The field used for dictionary (in schema.xml):
<copyField source="procname" dest="dtextspell" />
<field name = "dtextspell" stored="false" type="text_small" multiValued="true" indexed="true"/>
Definition of "text_small" (again in schema.xml) :
<fieldType name="text_small" class="solr.TextField" positionIncrementGap="100" omitNorms="true">
<analyzer type="index">
<tokenizer class="solr.StandardTokenizerFactory"/>
<filter class="solr.LowerCaseFilterFactory"/>
<filter class="solr.StandardFilterFactory"/>
</analyzer>
<analyzer type ="query">
<tokenizer class="solr.StandardTokenizerFactory"/>
<filter class="solr.LowerCaseFilterFactory"/>
<filter class="solr.StandardFilterFactory"/>
</analyzer>
</fieldType>
In solrconfig.xml :
<searchComponent name="spellcheck" class="solr.SpellCheckComponent">
<str name="queryAnalyzerFieldType">text_small</str>
<lst name="spellchecker">
<str name="name">default</str>
<str name="classname">solr.IndexBasedSpellChecker</str>
<str name="field">dtextspell</str>
<float name="thresholdTokenFrequency">.0001</float>
<str name="spellcheckIndexDir">./spellchecker</str>
<str name="field">name</str>
<str name="buildOnCommit">true</str>
</lst></searchComponent>
Attached it to the select request handler like this :
<requestHandler name="/select" class="solr.SearchHandler">
<lst name="defaults">
<str name="echoParams">explicit</str>
<int name="rows">10</int>
<str name="spellcheck.count">10</str>
<str name="df">text</str>
</lst>
<arr name="last-components">
<str>spellcheck</str>
</arr> </requestHandler>
To build the spell check :
http://localhost:8080/solr/select?q=*:*&spellcheck=true&spellcheck.build=true
To search for term :
http://localhost:8080/solr/select?q=procname:%22cacner%22&spellcheck=true&defType=edismax
The response XML :
<lst name="spellcheck"><lst name="suggestions">
<lst name="cacner">
<int name="numFound">1</int>
<int name="startOffset">10</int>
<int name="endOffset">16</int>
<arr name="suggestion">
<str>inner</str> <end tags start from here>
Hope it helps !!

Answer 1

Sounds like you've not rebuilt the spellchecker's index recently. Request a manual update by make a query with spellcheck=true&spellcheck.build=true appended to the query string (do NOT do this on every request, as the build process can take some time). You should also make sure that you're using the correct field to build your spellchecker's index.
You can also configure the spellchecker component to rebuild the index on every commit or on every optimize, by adding:
<str name="buildOnCommit">true</str>
or
<str name="buildOnOptimize">true</str>
to your spellchecker configuration.