title: Exact string match on Solr.text_general
body: <p>I have following string indexed into solr. </p>
  
  <pre><code>&lt;doc&gt;
  &lt;field name="key"&gt;book self&lt;/field&gt; &lt;/doc&gt;
  &lt;doc&gt;
  &lt;field name="key"&gt;bookself&lt;/field&gt; &lt;/doc&gt;
  &lt;doc&gt;
  &lt;field name="key"&gt;my book self&lt;/field&gt; &lt;/doc&gt;
  </code></pre>
  
  <p>When my query string have the word key:"book self" then i should only get first doc as result not the first and third document. Same when i search for 
  key:"self" it should return empty document. </p>
  
  <p>Please tell me how i can achieve above. </p>