Lucene: disable default english stop words set

Change-Id: Ia488b24e6a5580f97e9aa43df773ca406ed18b51
diff --git a/gerrit-lucene/src/main/java/com/google/gerrit/lucene/LuceneChangeIndex.java b/gerrit-lucene/src/main/java/com/google/gerrit/lucene/LuceneChangeIndex.java
index 286565b..c98bd5d 100644
--- a/gerrit-lucene/src/main/java/com/google/gerrit/lucene/LuceneChangeIndex.java
+++ b/gerrit-lucene/src/main/java/com/google/gerrit/lucene/LuceneChangeIndex.java
@@ -48,6 +48,7 @@
 import com.google.inject.assistedinject.AssistedInject;
 
 import org.apache.lucene.analysis.standard.StandardAnalyzer;
+import org.apache.lucene.analysis.util.CharArraySet;
 import org.apache.lucene.document.Document;
 import org.apache.lucene.document.Field;
 import org.apache.lucene.document.Field.Store;
@@ -112,7 +113,7 @@
 
   private static IndexWriterConfig getIndexWriterConfig(Config cfg, String name) {
     IndexWriterConfig writerConfig = new IndexWriterConfig(LUCENE_VERSION,
-        new StandardAnalyzer(LUCENE_VERSION));
+        new StandardAnalyzer(LUCENE_VERSION, CharArraySet.EMPTY_SET));
     writerConfig.setOpenMode(OpenMode.CREATE_OR_APPEND);
     double m = 1 << 20;
     writerConfig.setRAMBufferSizeMB(cfg.getLong("index", name, "ramBufferSize",