Prevent memory leaks in PerFieldAnalyzerWrapper

By overriding the 'close' method. Otherwise nothing will close the
defaultAnalyzer as well as all the fieldAnalyzers.

lucene/analysis/common/src/java/org/apache/lucene/analysis/miscellaneous/PerFieldAnalyzerWrapper.java

@@ -90,4 +90,11 @@ protected Analyzer getWrappedAnalyzer(String fieldName) {
   public String toString() {
     return "PerFieldAnalyzerWrapper(" + fieldAnalyzers + ", default=" + defaultAnalyzer + ")";
   }
+
+  @Override
+  public void close() {
+    defaultAnalyzer.close();
+    fieldAnalyzers.values().forEach(Analyzer::close);
+    super.close();
+  }
 }

lucene/analysis/common/src/test/org/apache/lucene/analysis/miscellaneous/TestPerFieldAnalyzerWrapper.java

@@ -68,10 +68,7 @@ public void testPerField() throws Exception {
       assertFalse(tokenStream.incrementToken());
       tokenStream.end();
     }
-    // TODO: fix this about PFAW, this is crazy
     analyzer.close();
-    defaultAnalyzer.close();
-    IOUtils.close(analyzerPerField.values());    
   }
 
   public void testReuseWrapped() throws Exception {
@@ -127,7 +124,7 @@ protected TokenStreamComponents wrapComponents(String fieldName, TokenStreamComp
     ts4 = wrapper3.tokenStream("moreSpecial", text);
     assertSame(ts3, ts4);
     assertSame(ts2, ts3);
-    IOUtils.close(wrapper3, wrapper2, wrapper1, specialAnalyzer, defaultAnalyzer);
+    IOUtils.close(wrapper3, wrapper2, wrapper1);
   }
 
   public void testCharFilters() throws Exception {
@@ -157,6 +154,5 @@ protected Reader initReader(String fieldName, Reader reader) {
         new int[] { 2 }
     );
     p.close();
-    a.close(); // TODO: fix this about PFAW, its a trap
   }
 }