So i did it like that now:
this.graph.createKeyIndex("ID", Vertex.class, new Parameter<String, String>(
"type", "UNIQUE"));
Vertex outVertex = this.graph.getVertices("ID", outID).iterator().next();
Vertex inVertex = this.graph.getVertices("ID", inID).iterator().next();
Edge edge = this.graph.addEdge(null, outVertex, inVertex, edgeName);
Is it correct? Because my index is unique the Iterator will just have one
entry.
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