Lab41/Dendrite — pull request #149 by erickt (2014-07-08 22:35:16+00:00)
Title: Fix subgraph carving using bad _ids

We weren't updating the "_vertexId" when copying graphs, which really
confused how subgraph carving happens. Since we our fork of titan-es
preserves _ids between Titan and ES, we can just use ES's "_id" field
and get rid of "_vertexId".