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Solved. First I tried Pierre Buyle answer, but if you unpublish a node, it can't be propper accessed and those nodes become useless. In my case I have parent and child nodes, only child nodes (for admin purposes) are the ones to be hidden and NOT be indexed by crawlers. What I did it with page manager made a url redirect (hiding these nodes to all users but admin) with a http response according to this tuturial by node.one and no-index nodes by crawlers is handleled by Node no-index module. This will work even if you don´t have paret-child node relationship.