Add clean_gitlab_redis_shared_state to search_results_spec.rb

To clear shared redis state

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

@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe Gitlab::Elastic::SearchResults, :elastic, :sidekiq_might_not_need_inline do
+RSpec.describe Gitlab::Elastic::SearchResults, :elastic, :clean_gitlab_redis_shared_state, :sidekiq_might_not_need_inline do
   before do
     stub_ee_application_setting(elasticsearch_search: true, elasticsearch_indexing: true)
   end