Set ACK timeout on indices service test

Setting a timeout here speeds the test up significantly since we do not
need to wait up the default of 30 seconds for shards to start, we only
need an ACK that the index was opened.

Author: jasontedor

core/src/test/java/org/elasticsearch/indices/IndicesServiceTests.java

@@ -241,7 +241,7 @@ public void testPendingTasks() throws Exception {
             assertEquals(indicesService.numPendingDeletes(test.index()), 0);
             assertTrue(indicesService.hasUncompletedPendingDeletes()); // "bogus" index has not been removed
         }
-        assertAcked(client().admin().indices().prepareOpen("test"));
+        assertAcked(client().admin().indices().prepareOpen("test").setTimeout(TimeValue.timeValueSeconds(1)));
 
     }