---++  GET api/metadata/lineage/vertices/:id/:direction
   * <a href="#Description">Description</a>
   * <a href="#Parameters">Parameters</a>
   * <a href="#Results">Results</a>
   * <a href="#Examples">Examples</a>

---++ Description
Get a list of adjacent vertices or edges with a direction.

---++ Parameters
   * :id is the id of the vertex.
   * doAs <optional query param> allows the current user to impersonate the user passed in doAs when interacting with the Falcon system.
   * :direction is the direction associated with the edges.

   To get the adjacent out vertices of vertex pass direction as out, in to get adjacent in vertices
   and both to get both in and out adjacent vertices. Similarly to get the out edges of vertex
   pass outE, inE to get in edges and bothE to get the both in and out edges of vertex.

      * out  : get the adjacent out vertices of vertex
      * in   : get the adjacent in vertices of vertex
      * both : get the both adjacent in and out vertices of vertex
      * outCount  : get the number of out vertices of vertex
      * inCount   : get the number of in vertices of vertex
      * bothCount : get the number of adjacent in and out vertices of vertex
      * outIds  : get the identifiers of out vertices of vertex
      * inIds   : get the identifiers of in vertices of vertex
      * bothIds : get the identifiers of adjacent in and out vertices of vertex

---++ Results
Adjacent vertices of the vertex for the specified direction.

---++ Examples
---+++ Rest Call
<verbatim>
GET http://localhost:15000/api/metadata/lineage/vertices/4/out
</verbatim>
---+++ Result
<verbatim>
{
    "results": [
        {
            "timestamp":"2014-04-21T20:55Z",
            "name":"sampleFeed",
            "type":"feed-instance",
            "_id":8,
            "_type":"vertex"
        }
    ],
    "totalSize":1}
}
</verbatim>

---+++ Rest Call
<verbatim>
GET http://localhost:15000/api/metadata/lineage/vertices/4/bothE
</verbatim>
---+++ Result
<verbatim>
{
    "results":[
        {
            "_id":"Q5V-4-5g",
            "_type":"edge",
            "_outV":4,
            "_inV":8,
            "_label":"output"
        }
    ],
    "totalSize":1
}
</verbatim>

---+++ Rest Call
<verbatim>
GET http://localhost:15000/api/metadata/lineage/vertices/4/bothE?doAs=joe
</verbatim>
---+++ Result
<verbatim>
{
    "results":[
        {
            "_id":"Q5V-4-5g",
            "_type":"edge",
            "_outV":4,
            "_inV":8,
            "_label":"output"
        }
    ],
    "totalSize":1
}
</verbatim>