using contexts constants in replace of string contexts

fix up endpoints

api/contexts/contexts.go

@@ -1,11 +1,12 @@
 package contexts
 
+// Context is a type which is searchable via a unique identifier.
 type Context string
 
 const (
-	Alloc Context = "allocs"
-	Eval  Context = "evals"
-	Job   Context = "jobs"
-	Node  Context = "nodes"
-	All   Context = ""
+	Allocs Context = "allocs"
+	Evals  Context = "evals"
+	Jobs   Context = "jobs"
+	Nodes  Context = "nodes"
+	All    Context = ""
 )

api/search.go

@@ -18,7 +18,7 @@ func (c *Client) Search() *Search {
 // context is not specified, matches for all contexts are returned.
 func (s *Search) PrefixSearch(prefix string, context c.Context) (*structs.SearchResponse, error) {
 	var resp structs.SearchResponse
-	req := &structs.SearchRequest{Prefix: prefix, Context: string(context)}
+	req := &structs.SearchRequest{Prefix: prefix, Context: context}
 
 	_, err := s.client.write("/v1/search", req, &resp, nil)
 	if err != nil {

api/search_test.go

@@ -25,7 +25,7 @@ func TestSearch_List(t *testing.T) {
 	assert.Nil(err)
 	assert.NotEqual(0, resp.Index)
 
-	jobMatches := resp.Matches[contexts.jobs]
+	jobMatches := resp.Matches[contexts.Jobs]
 	assert.Equal(1, len(jobMatches))
 	assert.Equal(id, jobMatches[0])
 }