Hi Yoann Rodière,

Thanks for the feedback.

I thought of this feature so we could further eliminate the external manual process and allow that hibernate-search to manage this.
But you're very right, this external process is needed anyway and making hibernate-search control this would not be good.

A real example, is in my current development project with wildfly I am evaluating how to do a manual deployment, make blue-green for this.

step 1 - In the first version in production my index will be called for example:

public static final String MY_INDEX_NAME="my_index_v1";
.....
@Indexed(index = myClass.MY_INDEX_NAME)
....

step 2 - I will index through a manual trigger;

fullTextEntityManager.createIndexer().startAndWait();

step 3 - I will create an alias manually for my_index;

POST /_aliases
{
    "actions" : [
        { "add" : { "index" : "my_index_v1", "alias" : "my_index" } }
    ]
}

step 4 - When a new version is released with the changed mappings, filters and parsers, I'm going to change the name of my index manually for my_index_v2;
Of course all this in a single Node.

public static final String MY_INDEX_NAME="my_index_v2";

step 5 - I will index through a manual trigger;

fullTextEntityManager.createIndexer().startAndWait();
// or with elasticseach reindex
POST _reindex
{
  "source": {
    "index": "my_index_v1"
  },
  "dest": {
    "index": "my_index_v2"
  }
}

step 6 - I make a blue-green of the index. I change manually the alias "my_index" to index "my_index_v2";

POST /_aliases
{
    "actions": [
        { "remove": { "index": "my_index_v1", "alias": "my_index" }},
        { "add":    { "index": "my_index_v2", "alias": "my_index" }}
    ]
}

step 7 - After everything is OK, I make blue-green with my load balancer, pointing to the new node.

And so on in the next versions.

I thought of doing this inside hibernate-search, but as you said, that responsibility should not be hibernate-search.

Maybe we could provide an configuration option to add a suffix to every index, But I do not know if we really need it, it would be just a cherry on the cake.

Regards.
Leandro K. de Freitas