Fix test after merge

Reindex did not compile due to addMapping having been removed.

Author: henningandersen

modules/reindex/src/test/java/org/elasticsearch/index/reindex/ReindexResilientSearchIT.java

@@ -72,7 +72,7 @@ public void testDataNodeRestart() throws Exception {
 
         // create index and mapping up front to avoid master involvement, since that can result in an item failing with NodeClosedException.
         assertAcked(prepareCreate("dest")
-            .addMapping("_doc", jsonBuilder()
+            .setMapping(jsonBuilder()
                 .startObject()
                     .startObject("properties")
                         .startObject("data")