LUCENE-10208: Remove unused import.
diff --git a/lucene/core/src/test/org/apache/lucene/search/TestTopFieldCollector.java b/lucene/core/src/test/org/apache/lucene/search/TestTopFieldCollector.java
index 0717b44..648830a 100644
--- a/lucene/core/src/test/org/apache/lucene/search/TestTopFieldCollector.java
+++ b/lucene/core/src/test/org/apache/lucene/search/TestTopFieldCollector.java
@@ -38,7 +38,6 @@
 import org.apache.lucene.search.FieldValueHitQueue.Entry;
 import org.apache.lucene.store.Directory;
 import org.apache.lucene.util.LuceneTestCase;
-import org.apache.lucene.util.NamedThreadFactory;
 import org.apache.lucene.util.TestUtil;
 
 import static org.apache.lucene.search.SortField.FIELD_SCORE;