Elasticsearch Alias, allows me to re-index without disconnecting the clients.
For example, I have an e-commerce that connects directly to elasticsearch.
I use hibernate-search in my erp to index my records from the database (100000 records).
But when doing reindex, hibernate-search deletes the records and inserts them again.
It would be cool to have a unique option to recreate the data in another index and after it has finished pointing to the alias. Allowing zero downtime.
Example:
On create:
1- my_index(alias) --- > my_index_v1
2- add new records (100000 records) in my_index_v1
On update (reindex):
1- my_index(alias) --- > my_index_v1
2- add new records (100000 records) in my_index_v2
3 - change my_index(alias) --- > my_index_v2
4 - remove and delete my_index_v1
In the documentation says this:
{panel:title=value:update}
The index, its mappings and analyzer definitions will be created, existing mappings will be updated if there are no conflicts. Caution: if analyzer definitions have to be updated, the index will be closed automatically during the update.
{panel}
Maybe a property like this:
{code:java}
<property name="hibernate.search.default.elasticsearch.index_schema_management_strategy" value="update-with-alias"/>
<property name="hibernate.search.default.elasticsearch.create_index_on_startup" value="true"/>
{code}
Index Aliases (Guide):
https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-aliases.html
Index Aliases and Zero Downtime (Reference):
https://www.elastic.co/guide/en/elasticsearch/guide/current/index-aliases.html
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