Connect to gremlin and open session
./gremlin.sh
:remote connect tinkerpop.server conf/remote.yaml session
:remote console
Give proper properties file to drop
gremlin> graph = JanusGraphFactory.open('/opt/janusgraph-1.0.0/conf/janusgraph-cql.properties')
==>standardjanusgraph[cql:[127.0.0.1]]
gremlin> JanusGraphFactory.drop(graph);