title: unexpected behaviour of "unfiltered" search in MarkLogic
body: <p>Unfiltered search is giving wrong results.</p>
  
  <p>please find the below xml samples and problem.</p>
  
  <p>Sample:</p>
  
  <pre><code>&lt;root&gt;
      &lt;id1&gt;11&lt;/id1&gt;
      &lt;elem1&gt;ee1&lt;/elem1&gt;
      &lt;ele2&gt;ee2&lt;/ele2&gt;
      &lt;entry&gt;
          &lt;volume&gt;10&lt;/volume&gt;
          &lt;issue&gt;10&lt;/issue&gt;
          &lt;elemEntry&gt;eleme&lt;/elemEntry&gt;
      &lt;/entry&gt;
      &lt;entry&gt;
          &lt;volume&gt;20&lt;/volume&gt;
          &lt;issue&gt;20&lt;/issue&gt;
          &lt;elemEntry&gt;eleme&lt;/elemEntry&gt;
      &lt;/entry&gt;
      &lt;entry&gt;
          &lt;volume&gt;20&lt;/volume&gt;
          &lt;issue&gt;10&lt;/issue&gt;
          &lt;elemEntry&gt;eleme&lt;/elemEntry&gt;
      &lt;/entry&gt;
      &lt;entry&gt;
          &lt;volume&gt;10&lt;/volume&gt;
          &lt;issue&gt;20&lt;/issue&gt;
          &lt;elemEntry&gt;eleme&lt;/elemEntry&gt;
      &lt;/entry&gt;
  &lt;/root&gt;
  </code></pre>
  
  <p>I have to get the entry nodes with value combination of <code>&lt;volume&gt; &amp; &lt;issue&gt;</code> both should present under <code>&lt;entry&gt;</code> node (like : volume-10 &amp; issue-10, volume-10 &amp; issue-20)</p>
  
  <p>As in the above example, I need the entire entry node as <code>&lt;volume&gt; (10), &lt;issue&gt; (10)</code>.</p>
  
  <p>It should not return me the other entry nodes as other entry nodes doesn't have the required <code>volume</code> (value 10), <code>issue</code> (value 10) combination.</p>
  
  <p>Please find below the <code>cts:search</code> which I am doing.</p>
  
  <pre><code>cts:search(
      doc("/sample.xml")//entry,
      cts:and-query((
          cts:element-value-query(xs:QName("volume"), "10", ("case-insensitive","unstemmed")),
          cts:element-value-query(xs:QName("issue"), "10", ("case-insensitive","unstemmed"))
      )),
      "unfiltered"
  )
  </code></pre>
  
  <p>Assume sample xml is stored in the DB with <code>/sample.xml</code> uri</p>
  
  <p>Above query is returning me the other entries (<code>&lt;entry&gt;</code>) also.</p>
  
  <p>If I will perform <strong>"filtered"</strong> search, above query is returning me the correct results.</p>
  
  <p><strong>Please tell me, why it is happening and what would be the solution</strong>.</p>
  
  <p>If there is any other good way to get the entry nodes having combination of <code>volume and issue</code> please let me know.</p>