Add iso time for create (#230)

* add iso time for create

* fix

Author: bhubam

document-store/src/main/java/org/hypertrace/core/documentstore/mongo/MongoCollection.java

@@ -332,6 +332,7 @@ private BasicDBObject prepareInsert(Key key, Document document) throws JsonProce
     long now = System.currentTimeMillis();
     BasicDBObject insertDbObject = prepareDocument(key, document, now);
     insertDbObject.put(CREATED_TIME, now);
+    insertDbObject.put(LAST_UPDATE_TIMESTAMP_ISO_8601, new Date(now));
     return insertDbObject;
   }