Add getWarmer and getTranslog method to NodeIndicesStats (#28092)

When calling the node stats action via the Java API it was not able to return
information about warmers and translog even though that is available through 
the REST API. This change adds methods to make the responses more 
consistent.

Author: Scott Somerville

core/src/main/java/org/elasticsearch/indices/NodeIndicesStats.java

@@ -26,7 +26,6 @@
 import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
 import org.elasticsearch.common.io.stream.Streamable;
-import org.elasticsearch.common.xcontent.ToXContent.Params;
 import org.elasticsearch.common.xcontent.ToXContentFragment;
 import org.elasticsearch.common.xcontent.XContentBuilder;
 import org.elasticsearch.index.Index;
@@ -43,6 +42,8 @@
 import org.elasticsearch.index.shard.DocsStats;
 import org.elasticsearch.index.shard.IndexingStats;
 import org.elasticsearch.index.store.StoreStats;
+import org.elasticsearch.index.translog.TranslogStats;
+import org.elasticsearch.index.warmer.WarmerStats;
 import org.elasticsearch.search.suggest.completion.CompletionStats;
 
 import java.io.IOException;
@@ -117,6 +118,11 @@ public FlushStats getFlush() {
         return stats.getFlush();
     }
 
+    @Nullable
+    public WarmerStats getWarmer() {
+        return stats.getWarmer();
+    }
+
     @Nullable
     public FieldDataStats getFieldData() {
         return stats.getFieldData();
@@ -142,6 +148,11 @@ public SegmentsStats getSegments() {
         return stats.getSegments();
     }
 
+    @Nullable
+    public TranslogStats getTranslog() {
+        return stats.getTranslog();
+    }
+
     @Nullable
     public RecoveryStats getRecoveryStats() {
         return stats.getRecoveryStats();