cache statistics are enabled even if the attribute is not set

The cache statistics are utilizized even if they are not configured

<cache-container name="clustered" default-cache="default" statistics="true">
....
<distributed-cache name="ExpirationCache">
<memory><object size="2"/></memory>
</distributed-cache>

the CLI command returns unexpected the statistics
[standalone@localhost:9990 /] /subsystem=datagrid-infinispan/cache-container=clustered/distributed-cache=ExpirationCache:read-attribute(name=evictions)
{
"outcome" => "success",
"result" => 5L
}