Examples of JDBC CacheStore configuration should remind about the shared attribute

The "shared" configuration attribute is defaulting to false even for database-based CacheStore instances as the attribute is defined in the parent of all CacheStore types.

The attribute isn't very visible either, as it's not explicitly listed among the available attributes (because it's inherited), and I think this is quite confusing as - while a non-shared configuration could be a choice - there's a strong assumption and expectation that these will point to a shared relational database.

I'd suggest to:

• add a highlighted reminder about this
• set the attribute explicitly in all example configurations

See also:

• http://stackoverflow.com/questions/37949448/duplicate-record-errors-in-hibernate-search-backed-by-infinispan-in-an-ec2-clust/38049866#38049866