Major Description
In some configurations, we need to open new cores with a given commit point.
For instance, when the publication of new documents must be controlled (legal obligations) in a master-slave configuration there are two cores on the same instanceDir and dataDir which are using two "versions" of the index.
The switch of the two cores is done manually.
The problem is that when the replication is done one day before the switch, if any problem occurs, and we need to restart tomcat, the new documents are published.
With this functionality, we could ensure that the index generation used by the core used for querying is always the good one.