Fixes #3955 - Elasticsearch-Rebuild does not index from new to old.

app/models/concerns/has_search_index_backend.rb

@@ -216,23 +216,26 @@ reload search index with full data
     def search_index_reload
       tolerance       = 10
       tolerance_count = 0
-      batch_size      = 100
-      query           = all.order(created_at: :desc)
+      query           = order(created_at: :desc)
       total           = query.count
-      query.find_in_batches(batch_size: batch_size).with_index do |group, batch|
-        group.each do |item|
-          next if item.ignore_search_indexing?(:destroy)
-
+      record_count    = 0
+      batch_size      = 100
+      query.as_batches(size: batch_size) do |record|
+        if !record.ignore_search_indexing?(:destroy)
           begin
-            item.search_index_update_backend
+            record.search_index_update_backend
           rescue => e
-            logger.error "Unable to send #{item.class}.find(#{item.id}).search_index_update_backend backend: #{e.inspect}"
+            logger.error "Unable to send #{record.class}.find(#{record.id}).search_index_update_backend backend: #{e.inspect}"
             tolerance_count += 1
             sleep 15
-            raise "Unable to send #{item.class}.find(#{item.id}).search_index_update_backend backend: #{e.inspect}" if tolerance_count == tolerance
+            raise "Unable to send #{record.class}.find(#{record.id}).search_index_update_backend backend: #{e.inspect}" if tolerance_count == tolerance
           end
         end
-        puts "\t#{[(batch + 1) * batch_size, total].min}/#{total}" # rubocop:disable Rails/Output
+
+        record_count += 1
+        if (record_count % batch_size).zero? || record_count == total
+          puts "\t#{record_count}/#{total}" # rubocop:disable Rails/Output
+        end
       end
     end
   end