title: Solr Spell Checking returns suggestions with exact match, case sensitive
body: <p>I am working with Solr SpellChecking. 
  I use the schemaless mode, default configuration is data driven and I indexed a csv file, inside the file content, there is a column Nationality, and some column values are <strong>S</strong>ingapore.
  Then I query spell check and I got result </p>
  
  <pre><code>&lt;response&gt;
      &lt;lst name="responseHeader"&gt;
          &lt;int name="status"&gt;0&lt;/int&gt;
          &lt;int name="QTime"&gt;7&lt;/int&gt;
      &lt;/lst&gt;
      &lt;result name="response" numFound="0" start="0"&gt;&lt;/result&gt;
      &lt;lst name="spellcheck"&gt;
          &lt;lst name="suggestions"&gt;
              &lt;lst name="singapor"&gt;
                  &lt;int name="numFound"&gt;1&lt;/int&gt;
                  &lt;int name="startOffset"&gt;0&lt;/int&gt;
                  &lt;int name="endOffset"&gt;8&lt;/int&gt;
                  &lt;int name="origFreq"&gt;0&lt;/int&gt;
                  &lt;arr name="suggestion"&gt;
                      &lt;lst&gt;
                          &lt;str name="word"&gt;singapore&lt;/str&gt;
                          &lt;int name="freq"&gt;104&lt;/int&gt;
                      &lt;/lst&gt;
                  &lt;/arr&gt;
              &lt;/lst&gt;
          &lt;/lst&gt;
          &lt;bool name="correctlySpelled"&gt;false&lt;/bool&gt;
          &lt;lst name="collations"&gt;
              &lt;lst name="collation"&gt;
                  &lt;str name="collationQuery"&gt;singapore&lt;/str&gt;
                  &lt;int name="hits"&gt;104&lt;/int&gt;
                  &lt;lst name="misspellingsAndCorrections"&gt;
                      &lt;str name="singapor"&gt;singapore&lt;/str&gt;
                  &lt;/lst&gt;
              &lt;/lst&gt;
          &lt;/lst&gt;
      &lt;/lst&gt;
  &lt;/response&gt;
  </code></pre>
  
  <p>I want the exact result with case sensitive <strong>S</strong>ingapore, not <strong>s</strong>ingapore.</p>
  
  <pre><code>&lt;str name="word"&gt;Singapore&lt;/str&gt;
  </code></pre>