Bind merge metrics

Author: BrianRothermich

server/src/main/java/org/elasticsearch/node/NodeConstruction.java

@@ -1284,6 +1284,7 @@ public Map<String, String> queryFields() {
             b.bind(FailureStoreMetrics.class).toInstance(failureStoreMetrics);
             b.bind(ShutdownPrepareService.class).toInstance(shutdownPrepareService);
             b.bind(OnlinePrewarmingService.class).toInstance(onlinePrewarmingService);
+            b.bind(MergeMetrics.class).toInstance(mergeMetrics);
         });
 
         if (ReadinessService.enabled(environment)) {