Add missing code

Author: drempapis

server/src/internalClusterTest/java/org/elasticsearch/search/stats/SearchStatsIT.java

@@ -140,6 +140,8 @@ public void testSimpleStats() throws Exception {
 
         indicesStats = indicesAdmin().prepareStats().setGroups("group1").get();
         assertThat(indicesStats.getTotal().getSearch().getGroupStats(), notNullValue());
+        assertThat(indicesStats.getTotal().getSearch().getGroupStats().get("group1").getDfsCount(), equalTo(0L));
+        assertThat(indicesStats.getTotal().getSearch().getGroupStats().get("group1").getDfsTimeInMillis(), equalTo(0L));
         assertThat(indicesStats.getTotal().getSearch().getGroupStats().get("group1").getQueryCount(), greaterThan(0L));
         assertThat(indicesStats.getTotal().getSearch().getGroupStats().get("group1").getQueryTimeInMillis(), greaterThan(0L));
         assertThat(indicesStats.getTotal().getSearch().getGroupStats().get("group1").getFetchCount(), greaterThan(0L));

server/src/main/java/org/elasticsearch/index/search/stats/SearchStats.java

@@ -124,6 +124,7 @@ private Stats(StreamInput in) throws IOException {
             suggestCurrent = in.readVLong();
 
             if (in.getTransportVersion().onOrAfter(TransportVersions.V_8_16_0)) {
+                dfsFailure = in.readVLong();
                 queryFailure = in.readVLong();
                 fetchFailure = in.readVLong();
             }