private Object convertToVertexId(final Graph graph, final String vertexName) {
        return convertToVertex(graph, vertexName).id();
    }
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-groovy/src/test/java/org/apache/tinkerpop/gremlin/groovy/jsr223/GremlinGroovyScriptEngineSandboxedStandardTest.java