log indexer options

fixes #2320

Author: Vladimir Kotal

opengrok-indexer/src/main/java/org/opengrok/indexer/index/Indexer.java

@@ -31,6 +31,7 @@
 import java.nio.file.Paths;
 import java.text.ParseException;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
@@ -774,6 +775,8 @@ public static String[] parseOptions(String[] argv) throws ParseException {
         // so that options may be overwritten later.
         configure.parse(argv);
 
+        LOGGER.log(Level.INFO, "Indexer options: {0}", Arrays.toString(argv));
+
         if (cfg == null) {
             cfg = new Configuration();
         }

opengrok-indexer/src/main/java/org/opengrok/indexer/util/OptionParser.java

@@ -519,7 +519,7 @@ protected String candidate(String option, int index) throws ParseException {
      * will cause a parse exception. If this is a scan parser, unrecognized
      * options are ignored.
      * 
-     * @param args
+     * @param args argument vector
      * @return non-option parameters, or all arguments after "--" encountered.
      * @throws ParseException 
      */