Fixed parameter text for index name.

Was erroneously referring to output directory.
Change-Id: I7298d0f3929540d17f606189f8b20bc32d6cc50e
diff --git a/src/main/scala/com/gerritforge/analytics/job/Main.scala b/src/main/scala/com/gerritforge/analytics/job/Main.scala
index d52b135..dc7be1a 100644
--- a/src/main/scala/com/gerritforge/analytics/job/Main.scala
+++ b/src/main/scala/com/gerritforge/analytics/job/Main.scala
@@ -64,7 +64,7 @@
     } text "output directory"
     opt[String]('e', "elasticIndex") optional() action { (x, c) =>
       c.copy(elasticIndex = Some(x))
-    } text "output directory"
+    } text "index name"
     opt[LocalDate]('s', "since") optional() action { (x, c) =>
       c.copy(since = Some(x))
     } text "begin date "