Drop graph not working


Hi all. 
I'm creating dynamic graphs using configuredGraphFactory in bigTable. I'm able to create them but when I try to delete them then it seems that they only get deleted from janusgraph-server and not from bigTable.
When I try to access the graph it says graph doesnt exists.. but I can still see it in the bigTable. When I try to manually delete the graph from BigTable server throw error like graph not found.
I used below cmd to delete the graph 
> ConfiguredGraphFactory.drop('graph_name') 


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