Improve ES specs runtime

ee/lib/gitlab/elastic/helper.rb

@@ -28,16 +28,16 @@ module Gitlab
         end
       end
 
-      def create_empty_index(with_alias: true)
+      def create_empty_index(with_alias: true, options: {})
         if index_exists?
           raise "Index under '#{target_name}' already exists, use `recreate_index` to recreate it."
         end
 
+        new_index_name = with_alias ? "#{target_name}-#{Time.now.strftime("%Y%m%d-%H%M")}" : target_name
+
         settings = {}
         mappings = {}
 
-        new_index_name = with_alias ? "#{target_name}-#{Time.now.strftime("%Y%m%d-%H%M")}" : target_name
-
         [
           Project,
           Issue,
@@ -52,6 +52,9 @@ module Gitlab
           mappings.deep_merge!(klass.__elasticsearch__.mappings.to_hash)
         end
 
+        settings.merge!(options[:settings]) if options[:settings]
+        mappings.merge!(options[:mappings]) if options[:mappings]
+
         create_index_options = {
           index: new_index_name,
           body: {

ee/spec/support/elastic.rb

@@ -4,7 +4,7 @@ RSpec.configure do |config|
   config.before(:each, :elastic) do
     Elastic::ProcessBookkeepingService.clear_tracking!
     Gitlab::Elastic::Helper.default.delete_index
-    Gitlab::Elastic::Helper.default.create_empty_index
+    Gitlab::Elastic::Helper.default.create_empty_index(options: { settings: { number_of_replicas: 0 } })
   end
 
   config.after(:each, :elastic) do