question

Traditionally you would use the valueMap step to get the properties and optionally the id and label of the vertex.

g.V().hasId('customid').valueMap();

will return all of the properties of that vertex.

g.V().hasId('customid').valueMap(true);

will also return the ID and the label.

In recent versions of TinkerPop (and DS Graph), there is a cleaner alternative to valueMap called elementMap.

g.V().hasId('customid').elementMap();

and this is essentially equivalent to

g.V().hasId('customid').valueMap(true).by(unfold());

As a recommendation, I would always specify the vertex label with DataStax Graph because it allows the engine to know what vertex/table to start in. So I would do something like:

g.V().hasLabel('order').has('orderid', 1001).elementMap();

or more succinctly

g.V().has('order', 'orderid', 1001).elementMap();

See also

https://tinkerpop.apache.org/docs/current/reference/#elementmap-step
https://tinkerpop.apache.org/docs/current/reference/#valuemap-step
http://www.kelvinlawrence.net/book/PracticalGremlin.html#element-map
http://www.kelvinlawrence.net/book/PracticalGremlin.html#vm