add iso time for create

Author: bhubam

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

@@ -340,6 +340,7 @@ private BasicDBObject prepareDocument(Key key, Document document, long now)
     BasicDBObject basicDBObject = getSanitizedBasicDBObject(document);
     basicDBObject.put(ID_KEY, key.toString());
     basicDBObject.put(LAST_UPDATED_TIME, now);
+    basicDBObject.put(LAST_UPDATE_TIMESTAMP_ISO_8601, new Date(now));
     return basicDBObject;
   }