ATLAS-2980: fix HBaseBasedAuditRepository.putEventsV2() to store entity-json string

repository/src/main/java/org/apache/atlas/repository/audit/CassandraBasedAuditRepository.java

@@ -117,7 +117,7 @@ public class CassandraBasedAuditRepository extends AbstractStorageBasedAuditRepo
     BatchStatement batch = new BatchStatement();
     events.forEach(event -> batch.add(stmt.bind(event.getEntityId(), event.getTimestamp(),
         event.getAction().toString(), event.getUser(), event.getDetails(),
-        (persistEntityDefinition ? event.getEntity().toString() : null))));
+        (persistEntityDefinition ? event.getEntityDefinitionString() : null))));
     cassSession.execute(batch);
   }
 

repository/src/main/java/org/apache/atlas/repository/audit/HBaseBasedAuditRepository.java

@@ -189,7 +189,7 @@ public class HBaseBasedAuditRepository extends AbstractStorageBasedAuditReposito
                 addColumn(put, COLUMN_TYPE, ENTITY_AUDIT_V2);
 
                 if (persistEntityDefinition) {
-                    addColumn(put, COLUMN_DEFINITION, event.getEntity());
+                    addColumn(put, COLUMN_DEFINITION, event.getEntityDefinitionString());
                 }
 
                 puts.add(put);