Fix records not being indexed sometimes (#12024)

It's possible that after commit callbacks were not firing when
exceptions occurred in the process. Also, the default Sidekiq
strategy does not push indexing jobs immediately, which is not
necessary and could be part of the issue too.

lib/chewy/strategy/custom_sidekiq.rb

@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+module Chewy
+  class Strategy
+    class CustomSidekiq < Base
+      class Worker
+        include ::Sidekiq::Worker
+
+        sidekiq_options queue: 'pull'
+
+        def perform(type, ids, options = {})
+          options[:refresh] = !Chewy.disable_refresh_async if Chewy.disable_refresh_async
+          type.constantize.import!(ids, options)
+        end
+      end
+
+      def update(type, objects, _options = {})
+        return unless Chewy.enabled?
+
+        ids = type.root.id ? Array.wrap(objects) : type.adapter.identify(objects)
+
+        return if ids.empty?
+
+        Worker.perform_async(type.name, ids)
+      end
+
+      def leave; end
+    end
+  end
+end