Custom Lucene Sharding with Hibernate Search

Does anyone have any experience with Lucene sharding / paritioning using hibernate search ?

The Hibernate Search documentation says the following about Lucene Sharding:

In some cases, you need to split (shard) the indexing data of a given object type into multiple Lucene indexes. This solution is not recommended if not because by default the search will be slower as all shards must be open for one search. In other words don't do it until you have a problem :)

Has anyone implemented sculpting in this way for Hibernate Search so that queries can target one of the shards?

In our case, we have Lucene requests that should target only one shard per request.