Cannot find elasticsearch index janusgraph

I'm using janusgraph-cassandra-es .First time, it's working.But after i'v deleted all the data in cassandra and es , es index janusgraph can not be created after graph index has been created.And the index is in enabled status.

Start by reproducing the problem with the janusgraph-cassandra-es setup after deleting all Cassandra and Elasticsearch data. Inspect the graph index creation and Elasticsearch index creation flow, focusing on why the janusgraph index remains absent while the graph index is enabled. Done means the Elasticsearch index is created reliably after the data reset.

Written by the indexing model from the issue text.