span></code></th>
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<div class="block">An index backed by a <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentSkipListMap.html?is-external=true" title="class or interface in java.util.concurrent" class="externalLink"><code>ConcurrentSkipListMap</code></a>.</div>
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<td class="colFirst"><code>class&nbsp;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../index/navigable/PartialNavigab