Write a helper to reindex the whole index based on schema_version
Background
Sometimes we need to reindex the whole index. Writing the full migration code every time is so much work.
Proposal
A better way is to use a helper to reindex. This maintenance issue is to create a new ElasticHelper which reindexes the whole index. We have a field schema_version
which can be used to determine if the reindexing is finished.