API - fix searching in group/project specified by path

# Conflicts:
#	lib/api/search.rb
#	spec/requests/api/search_spec.rb

lib/api/search.rb

@@ -109,9 +109,9 @@ module API
       end
       get ':id/-/search' do
         check_elasticsearch_scope!
-        find_group!(params[:id])
+        group = find_group!(params[:id])
 
-        present search(group_id: params[:id]), with: entity
+        present search(group_id: group.id), with: entity
       end
     end
 
@@ -130,9 +130,9 @@ module API
         use :pagination
       end
       get ':id/-/search' do
-        find_project!(params[:id])
+        project = find_project!(params[:id])
 
-        present search(project_id: params[:id]), with: entity
+        present search(project_id: project.id), with: entity
       end
     end
   end

spec/requests/api/search_spec.rb

@@ -265,7 +265,19 @@ describe API::Search do
         it_behaves_like 'response is correct', schema: 'public_api/v4/milestones'
       end
 
-      context 'when elasticsearch is enabled' do
+      context 'for milestones scope with group path as id' do
+        before do
+          another_project = create(:project, :public)
+          create(:milestone, project: project, title: 'awesome milestone')
+          create(:milestone, project: another_project, title: 'awesome milestone other project')
+
+          get api("/groups/#{CGI.escape(group.full_path)}/-/search", user), scope: 'milestones', search: 'awesome'
+        end
+
+        it_behaves_like 'response is correct', schema: 'public_api/v4/milestones'
+      end
+
+      context 'when elasticsearch is disabled' do
         it_behaves_like 'elasticsearch disabled' do
           let(:endpoint) { "/groups/#{group.id}/-/search" }
         end
@@ -382,6 +394,14 @@ describe API::Search do
         it_behaves_like 'response is correct', schema: 'public_api/v4/commits'
       end
 
+      context 'for commits scope with project path as id' do
+        before do
+          get api("/projects/#{CGI.escape(repo_project.full_path)}/-/search", user), scope: 'commits', search: '498214de67004b1da3d820901307bed2a68a8ef6'
+        end
+
+        it_behaves_like 'response is correct', schema: 'public_api/v4/commits'
+      end
+
       context 'for blobs scope' do
         before do
           get api("/projects/#{repo_project.id}/-/search", user), scope: 'blobs', search: 'monitors'