"default for enabled is false" is very confusing just looking at it.  Is there a better way maybe?

Both of the following sentences are confusing. "This functionality can be activated setting the enabled attribute to true in all nodes, but again only the coordinator of the cluster will the modifications in the underlying cache loader as defined in loader element. You cannot define a shared and with singletonStore enabled at the same time."

Maybe "This functionality must be configured by setting the enabled attribute to true in all nodes.  Only the coordinator of the cluster will persist data, but all nodes must have this configured to prevent others from persisting as well. You cannot configure a store as shared and singleton."