Upgrade documentation Lucene version to 4.7

Change-Id: If101ff67f0489e8b9d1211d37680c5b32831043c
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/documentation/QueryDocumentationExecutor.java b/gerrit-server/src/main/java/com/google/gerrit/server/documentation/QueryDocumentationExecutor.java
index ca8ae2c..763437f 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/documentation/QueryDocumentationExecutor.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/documentation/QueryDocumentationExecutor.java
@@ -46,8 +46,7 @@
   private static final Logger log =
       LoggerFactory.getLogger(QueryDocumentationExecutor.class);
 
-  @SuppressWarnings("deprecation")
-  private static final Version LUCENE_VERSION = Version.LUCENE_46;
+  private static final Version LUCENE_VERSION = Version.LUCENE_47;
 
   private IndexSearcher searcher;
   private QueryParser parser;
diff --git a/lib/asciidoctor/java/DocIndexer.java b/lib/asciidoctor/java/DocIndexer.java
index 320d7e6..cf44662 100644
--- a/lib/asciidoctor/java/DocIndexer.java
+++ b/lib/asciidoctor/java/DocIndexer.java
@@ -51,8 +51,7 @@
 import java.util.zip.ZipOutputStream;
 
 public class DocIndexer {
-  @SuppressWarnings("deprecation")
-  private static final Version LUCENE_VERSION = Version.LUCENE_46;
+  private static final Version LUCENE_VERSION = Version.LUCENE_47;
   private static final Pattern SECTION_HEADER = Pattern.compile("^=+ (.*)");
 
   @Option(name = "-o", usage = "output JAR file")