Index: lucene/core/src/java/org/apache/lucene/index/DocumentsWriterPerThreadPool.java
===================================================================
--- lucene/core/src/java/org/apache/lucene/index/DocumentsWriterPerThreadPool.java	(revision 1329354)
+++ lucene/core/src/java/org/apache/lucene/index/DocumentsWriterPerThreadPool.java	(working copy)
@@ -36,7 +36,7 @@
  * new {@link DocumentsWriterPerThread} instance.
  * </p>
  */
-public abstract class DocumentsWriterPerThreadPool {
+abstract class DocumentsWriterPerThreadPool {
   
   /**
    * {@link ThreadState} references and guards a
Index: lucene/core/src/java/org/apache/lucene/index/IndexWriterConfig.java
===================================================================
--- lucene/core/src/java/org/apache/lucene/index/IndexWriterConfig.java	(revision 1329354)
+++ lucene/core/src/java/org/apache/lucene/index/IndexWriterConfig.java	(working copy)
@@ -571,7 +571,7 @@
    * </p>
    * <p>
    * NOTE: This only takes effect when IndexWriter is first created.</p>*/
-  public IndexWriterConfig setIndexerThreadPool(DocumentsWriterPerThreadPool threadPool) {
+  IndexWriterConfig setIndexerThreadPool(DocumentsWriterPerThreadPool threadPool) {
     if(threadPool == null) {
       throw new IllegalArgumentException("DocumentsWriterPerThreadPool must not be nul");
     }
@@ -582,7 +582,7 @@
   /** Returns the configured {@link DocumentsWriterPerThreadPool} instance.
    * @see #setIndexerThreadPool(DocumentsWriterPerThreadPool)
    * @return the configured {@link DocumentsWriterPerThreadPool} instance.*/
-  public DocumentsWriterPerThreadPool getIndexerThreadPool() {
+  DocumentsWriterPerThreadPool getIndexerThreadPool() {
     return this.indexerThreadPool;
   }
 
Index: lucene/test-framework/src/java/org/apache/lucene/util/LuceneTestCase.java
===================================================================
--- lucene/test-framework/src/java/org/apache/lucene/util/LuceneTestCase.java	(revision 1329354)
+++ lucene/test-framework/src/java/org/apache/lucene/util/LuceneTestCase.java	(working copy)
@@ -26,6 +26,7 @@
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
+import java.lang.reflect.Method;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
@@ -35,8 +36,8 @@
 import java.util.Iterator;
 import java.util.List;
 import java.util.Locale;
+import java.util.Map.Entry;
 import java.util.Map;
-import java.util.Map.Entry;
 import java.util.Random;
 import java.util.Set;
 import java.util.TimeZone;
@@ -53,11 +54,11 @@
 import org.apache.lucene.document.FieldType;
 import org.apache.lucene.index.AtomicReader;
 import org.apache.lucene.index.CompositeReader;
+import org.apache.lucene.index.DirectoryReader;
 import org.apache.lucene.index.FieldFilterAtomicReader;
 import org.apache.lucene.index.FieldInfo;
-import org.apache.lucene.index.DirectoryReader;
+import org.apache.lucene.index.IndexReader.ReaderClosedListener;
 import org.apache.lucene.index.IndexReader;
-import org.apache.lucene.index.IndexReader.ReaderClosedListener;
 import org.apache.lucene.index.IndexWriterConfig;
 import org.apache.lucene.index.LogByteSizeMergePolicy;
 import org.apache.lucene.index.LogDocMergePolicy;
@@ -74,21 +75,21 @@
 import org.apache.lucene.index.TieredMergePolicy;
 import org.apache.lucene.search.AssertingIndexSearcher;
 import org.apache.lucene.search.BooleanQuery;
+import org.apache.lucene.search.FieldCache.CacheEntry;
 import org.apache.lucene.search.FieldCache;
-import org.apache.lucene.search.FieldCache.CacheEntry;
 import org.apache.lucene.search.IndexSearcher;
+import org.apache.lucene.search.QueryUtils.FCInvisibleMultiReader;
 import org.apache.lucene.search.RandomSimilarityProvider;
 import org.apache.lucene.search.similarities.DefaultSimilarity;
 import org.apache.lucene.search.similarities.Similarity;
-import org.apache.lucene.search.QueryUtils.FCInvisibleMultiReader;
 import org.apache.lucene.store.Directory;
 import org.apache.lucene.store.FSDirectory;
 import org.apache.lucene.store.FlushInfo;
 import org.apache.lucene.store.IOContext;
 import org.apache.lucene.store.LockFactory;
 import org.apache.lucene.store.MergeInfo;
+import org.apache.lucene.store.MockDirectoryWrapper.Throttling;
 import org.apache.lucene.store.MockDirectoryWrapper;
-import org.apache.lucene.store.MockDirectoryWrapper.Throttling;
 import org.apache.lucene.store.NRTCachingDirectory;
 import org.apache.lucene.util.FieldCacheSanityChecker.Insanity;
 import org.junit.After;
@@ -108,7 +109,6 @@
 import org.junit.runner.notification.RunListener;
 import org.junit.runners.model.MultipleFailureException;
 import org.junit.runners.model.Statement;
-
 import com.carrotsearch.randomizedtesting.JUnit4MethodProvider;
 import com.carrotsearch.randomizedtesting.MixWithSuiteName;
 import com.carrotsearch.randomizedtesting.RandomizedContext;
@@ -1068,13 +1068,38 @@
     if (r.nextBoolean()) {
       int maxNumThreadStates = rarely(r) ? _TestUtil.nextInt(r, 5, 20) // crazy value
           : _TestUtil.nextInt(r, 1, 4); // reasonable value
-      if (rarely(r)) {
-        // random thread pool
-        c.setIndexerThreadPool(new RandomDocumentsWriterPerThreadPool(maxNumThreadStates, r));
-      } else {
-        // random thread pool
-        c.setIndexerThreadPool(new ThreadAffinityDocumentsWriterThreadPool(maxNumThreadStates));
+
+      Method setIndexerThreadPoolMethod = null;
+      try {
+        // Retrieve the package-private setIndexerThreadPool
+        // method:
+        for(Method m : IndexWriterConfig.class.getDeclaredMethods()) {
+          if (m.getName().equals("setIndexerThreadPool")) {
+            m.setAccessible(true);
+            setIndexerThreadPoolMethod = m;
+            break;
+          }
+        }
+      } catch (Exception e) {
+        // Should not happen?
+        throw new RuntimeException(e);
       }
+
+      if (setIndexerThreadPoolMethod == null) {
+        throw new RuntimeException("failed to lookup IndexWriterConfig.setIndexerThreadPool method");
+      }
+
+      try {
+        if (rarely(r)) {
+          // random thread pool
+          setIndexerThreadPoolMethod.invoke(c, new RandomDocumentsWriterPerThreadPool(maxNumThreadStates, r));
+        } else {
+          // random thread pool
+          setIndexerThreadPoolMethod.invoke(c, new ThreadAffinityDocumentsWriterThreadPool(maxNumThreadStates));
+        }
+      } catch (Exception e) {
+        throw new RuntimeException(e);
+      }
     }
 
     if (rarely(r)) {