Remove deprecated method getOp()

Change-Id: I89250ce53a98a3b60beac3a19eda98bc1991e1af
diff --git a/src/main/java/net/onrc/onos/core/topology/NetworkGraphDatastore.java b/src/main/java/net/onrc/onos/core/topology/NetworkGraphDatastore.java
index f5aec14..08eb061 100644
--- a/src/main/java/net/onrc/onos/core/topology/NetworkGraphDatastore.java
+++ b/src/main/java/net/onrc/onos/core/topology/NetworkGraphDatastore.java
@@ -70,7 +70,7 @@
         if (failed) {
             log.error("Adding Switch {} and its ports failed.", sw.getDpid());
             for (WriteOp op : groupOp) {
-                log.debug("Operation:{} for {} - Result:{}", op.getOp(), op.getObject(), op.getStatus());
+                log.debug("Operation:{} for {} - Result:{}", op.getOperation(), op.getObject(), op.getStatus());
 
                 // If we changed the operation from ForceCreate to
                 // Conditional operation (Create/Update) then we should retry here.