Partitioned DocumentTree primitive

Change-Id: I7e1712e1b7103756f9c8c6ad7118f8da5bb0fa2f
diff --git a/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixDocumentTree.java b/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixDocumentTree.java
index b8c1248..eadaa7e 100644
--- a/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixDocumentTree.java
+++ b/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixDocumentTree.java
@@ -103,7 +103,7 @@
 
     @Override
     public DocumentPath root() {
-        return DocumentPath.from("root");
+        return DocumentPath.ROOT;
     }
 
     @Override