uschindler commented on code in PR #11852:
URL: https://github.com/apache/lucene/pull/11852#discussion_r996473127


##########
lucene/luke/src/java/org/apache/lucene/luke/app/web/LukeWebMain.java:
##########
@@ -17,31 +17,78 @@
 
 package org.apache.lucene.luke.app.web;
 
+import java.net.InetSocketAddress;
 import java.util.concurrent.CountDownLatch;
+import java.util.HashMap;
+import java.util.Map;
 import org.apache.lucene.luke.app.IndexHandler;
 import org.apache.lucene.luke.util.LoggerFactory;
 
 /** Entry class for web Luke */
-public class LukeWebMain {
+public final class LukeWebMain {
+
+  private LukeWebMain() {
+  }
 
   static {
     LoggerFactory.initGuiLogging();
   }
 
   public static void main(String[] args) throws Exception {
-    String index = null;
-    if (args.length == 2 && args[0].equals("--index")) {
-      index = args[1];
-    } else {
-      System.err.println("usage: LukeWebMain --index <path-to-index>");
-      Runtime.getRuntime().exit(1);
+    Map<String, Object> parsed = null;
+    try {
+      parsed = parseArgs(args);
+    } catch (Exception e) {
+      usage(e.getMessage());
     }
-
     IndexHandler indexHandler = IndexHandler.getInstance();
-    indexHandler.open(index, "org.apache.lucene.store.FSDirectory", true, 
true, false);
+    indexHandler.open(getIndex(parsed), "org.apache.lucene.store.FSDirectory", 
true, true, false);
     CountDownLatch tombstone = new CountDownLatch(1);
-    HttpService httpService = new HttpService(indexHandler, tombstone);
+    HttpService httpService = new HttpService(getSockAddr(parsed), 
indexHandler, tombstone);
     httpService.start();
     tombstone.await();
   }
+
+  private static String getIndex(Map<String, Object> args) {
+    String index = (String) args.get("index");
+    if (index == null) {
+      usage("index arg is required");
+    }
+    return index;
+  }
+
+  private static InetSocketAddress getSockAddr(Map<String, Object> args) {
+    String host = (String) args.get("host");
+    int port = (Integer) args.getOrDefault("port", 8080);
+    if (host == null) {
+      return new InetSocketAddress(port);

Review Comment:
   Just set the default to "::1" (IPv6 localhost). If somebody has a broken 
configured system heshe can always set a cutsom ip address.



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