我正在努力解决 Solr 中的 SpellCheckComponent（使用 solr 4.4 和 4.5 测试）。我有一个定义如下的字段类型：
<fieldtype name="termSuggest" class="solr.TextField" positionIncrementGap="100">
<analyzer type="index">
<tokenizer class="solr.WhitespaceTokenizerFactory" />
<filter class="solr.LowerCaseFilterFactory" />
<filter class="solr.PatternReplaceFilterFactory" pattern="(^[^A-Za-z0-9ÄÖÜßäöü]*|[^A-Za-z0-9ÄÖÜßäöü]*$)"
replacement="" replace="all" />
<filter class="solr.LengthFilterFactory" min="2" max="60" />
<filter class="solr.StopFilterFactory" ignoreCase="true" words="lang/stopwords_de.txt" format="snowball" />
<filter class="solr.ShingleFilterFactory" maxShingleSize="3" outputUnigrams="true" outputUnigramsIfNoShingles="true"
tokenSeparator=" "/>
<filter class="solr.RemoveDuplicatesTokenFilterFactory" />
</analyzer>
<analyzer type="query">
<tokenizer class="solr.WhitespaceTokenizerFactory" />
<filter class="solr.LowerCaseFilterFactory" />
<filter class="solr.StopFilterFactory" ignoreCase="true" words="lang/stopwords_de.txt" format="snowball" />
<filter class="solr.ShingleFilterFactory" maxShingleSize="99" outputUnigrams="false" outputUnigramsIfNoShingles="true"
tokenSeparator=" "/>
</analyzer>
</fieldtype>
使用 solr 管理分析器调查相应的字段，我可以看到，该字段在索引和查询模式下被正确分析。特别是，它是小写的。
但是，如果我在 SpellCheckerComponent 中使用此字段，我只会在术语以小写形式提供的情况下获得建议（例如，“bautrokner”有效，“Bautrokner”无效）。组件和请求处理程序定义为 solr wiki 中提供的（我知道 shingles 可能不是拼写更正所必需的，但我也使用该字段进行自动建议 - 完全相同的问题）：
<searchComponent name="spellcheck" class="solr.SpellCheckComponent">
<!-- 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">_termsuggest</str>
<str name="classname">solr.DirectSolrSpellChecker</str>
<!-- the spellcheck distance measure used, the default is the internal levenshtein -->
<str name="distanceMeasure">internal</str>
<!-- minimum accuracy needed to be considered a valid spellcheck suggestion -->
<float name="accuracy">0.2</float>
<!-- the maximum #edits we consider when enumerating terms: can be 1 or 2 -->
<int name="maxEdits">2</int>
<!-- the minimum shared prefix when enumerating terms -->
<int name="minPrefix">1</int>
<!-- maximum number of inspections per result. -->
<int name="maxInspections">5</int>
<!-- minimum length of a query term to be considered for correction -->
<int name="minQueryLength">4</int>
<!-- maximum threshold of documents a query term can appear to be considered for correction -->
<!--<float name="maxQueryFrequency">0.01</float>-->
<!-- uncomment this to require suggestions to occur in 1% of the documents <float name="thresholdTokenFrequency">.01</float> -->
</lst>
</searchComponent>
<requestHandler name="/spell" class="solr.SearchHandler" startup="lazy">
<lst name="defaults">
<str name="df">_termsuggest</str>
<str name="spellcheck.dictionary">default</str>
<str name="spellcheck">on</str>
<str name="spellcheck.extendedResults">true</str>
<str name="spellcheck.count">10</str>
<str name="spellcheck.alternativeTermCount">5</str>
<str name="spellcheck.maxResultsForSuggest">5</str>
<str name="spellcheck.collate">true</str>
<str name="spellcheck.collateExtendedResults">true</str>
<str name="spellcheck.maxCollationTries">10</str>
<str name="spellcheck.maxCollations">5</str>
</lst>
<arr name="last-components">
<str>spellcheck</str>
</arr>
</requestHandler>
我已经搜索了几个小时的类似问题，但我找不到任何提示是什么问题。我希望由于查询分析器的原因，查询词应该小写。但情况似乎并非如此。
马蒂亚斯