--- a/src/goodjava/lucene/logging/LoggingIndexWriter.java	Sun May 10 22:28:13 2020 -0600
+++ b/src/goodjava/lucene/logging/LoggingIndexWriter.java	Sun May 10 22:48:15 2020 -0600
@@ -13,6 +13,8 @@
 import java.util.List;
 import java.util.ArrayList;
 import java.util.Random;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ExecutorService;
 import org.apache.lucene.document.Document;
 import org.apache.lucene.index.DirectoryReader;
 import org.apache.lucene.index.IndexReader;
@@ -43,6 +45,7 @@
 	private static final int OP_ADD_DOCUMENT = 3;
 	private static final int OP_UPDATE_DOCUMENT = 4;
 	private static final Random rnd = new Random();
+	protected static final ExecutorService threadPool = Executors.newCachedThreadPool();
 
 	public final LuceneIndexWriter indexWriter;
 	private final File logDir;
@@ -343,7 +346,7 @@
 		}
 		if( logs.size() > 3 ) {
 			isMerging = true;
-			new Thread(mergeLogs).start();
+			threadPool.execute(mergeLogs);
 //			mergeLogs.run();
 		}
 	}