Removed unused class field

application/src/main/java/org/thingsboard/server/service/edge/DefaultEdgeNotificationService.java

@@ -37,7 +37,6 @@ import org.thingsboard.server.service.edge.rpc.processor.CustomerEdgeProcessor;
 import org.thingsboard.server.service.edge.rpc.processor.EdgeProcessor;
 import org.thingsboard.server.service.edge.rpc.processor.EntityEdgeProcessor;
 import org.thingsboard.server.service.edge.rpc.processor.RelationEdgeProcessor;
-import org.thingsboard.server.service.executors.DbCallbackExecutorService;
 import org.thingsboard.server.service.queue.TbClusterService;
 
 import javax.annotation.PostConstruct;
@@ -61,9 +60,6 @@ public class DefaultEdgeNotificationService implements EdgeNotificationService {
     @Autowired
     private TbClusterService clusterService;
 
-    @Autowired
-    private DbCallbackExecutorService dbCallbackExecutorService;
-
     @Autowired
     private EdgeProcessor edgeProcessor;