Fix spec failures in ee/spec/lib/gitlab/elastic/search_results_spec.rb

There are two issues:

1. When a Wiki was disabled, the spec was still trying to create a
Wiki page, which would cause Gitaly to create the repository and fire
hooks. Since Rails isn't running an internal API server, this fails.

2. For private Wikis, the Wiki repository needs to be created with the
:wiki_repo trait in order to clear hooks to prevent Gitaly from
contacting the internal API server.

ee/spec/lib/gitlab/elastic/search_results_spec.rb

@@ -537,8 +537,10 @@ describe Gitlab::Elastic::SearchResults do
     subject(:wiki_blobs) { results.objects('wiki_blobs') }
 
     before do
+      if project_1.wiki_enabled?
         project_1.wiki.create_page('index_page', 'term')
         project_1.wiki.index_blobs
+      end
 
       Gitlab::Elastic::Helper.refresh_index
     end
@@ -593,7 +595,7 @@ describe Gitlab::Elastic::SearchResults do
     end
 
     context 'when wiki is internal' do
-      let(:project_1) { create(:project, :public, :repository, :wiki_private) }
+      let(:project_1) { create(:project, :public, :repository, :wiki_private, :wiki_repo) }
 
       context 'search by member' do
         let(:limit_project_ids) { [project_1.id] }