Removes optional flag from write operation
Removes optional flag from write operation

yebrahim/datalab,parthea/datalab,parthea/datalab,craigcitro/datalab,yebrahim/datalab,googledatalab/datalab,googledatalab/datalab,googledatalab/datalab,parthea/datalab,parthea/datalab,googledatalab/datalab,parthea/datalab,googledatalab/datalab,yebrahim/datalab,craigcitro/datalab,yebrahim/datalab,craigcitro/datalab,craigcitro/datalab,craigcitro/datalab,yebrahim/datalab,parthea/datalab,googledatalab/datalab