title: Running query in gremlin-console, getting "Unable to create an OLAP traversal Source when spark is not running or cannot be detected"
body: <p>according to :</p>
  <p><a href="https://docs.datastax.com/en/latest-dse/datastax_enterprise/graph/graphAnalytics/northwindDemoGraphSnapshot.html" rel="nofollow noreferrer">https://docs.datastax.com/en/latest-dse/datastax_enterprise/graph/graphAnalytics/northwindDemoGraphSnapshot.html</a></p>
  <p>I connected in OLAP mode and got the above failure.</p>
  <p>I did 'dse spark' , successfully . But I don't understand why I cannot run OLAP queries.
  Im using datastax dse graph cluster on multiple machines</p>