ES: fix specs

spec/workers/post_receive_spec.rb

@@ -24,6 +24,7 @@ describe PostReceive do
     it "triggers wiki index update" do
       allow(Gitlab.config.elasticsearch).to receive(:enabled).and_return(true)
       expect(Project).to receive(:find_with_namespace).with(project.path_with_namespace).and_return(project)
+      expect(Project).to receive(:find_with_namespace).with("#{project.path_with_namespace}.wiki").and_return(nil)
       expect_any_instance_of(ProjectWiki).to receive(:index_blobs)
 
       repo_path = "#{pwd(project)}.wiki"