java.util">Set</a>&lt;<a href="http://download.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&gt; hiddenExpressions</pre>
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<pre>protected&nbsp;<a href="http://lucene.apache.org/core/5_1_0/core/org/apache/lucene/index/LeafReaderContext.html?is-external=true" title="class or interface in org.apache.lucene.index">LeafReaderCont