search core module doesn't index node correctly

Issue Summary

If you define one user group (at least) with no read access, cron indexing task does not index the node.

But if you
- define read access for all the user groups on the node
- run cron task indexing
- redefine no read access for the user group

then search feature is correct.

search results display the node for each group with read permission but doesn't includes to groups with no read permissions.

=> All the nodes must be index.