[index] refresh the index after performing the `es_index` operation. (closes #51594388)

If this is not done, elasticsearch.scan method retrieves the old index values
so wrong values will be copied while synchronizing different indexes.

We probably should do it by default in `indexer.es_index` method.
We probably should do it in `indexer.es_delete` method.

see also https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-refresh.html