A police recruit does not have a civil rights claim against the instructor who struck him on the head with a metal baton and gave him a concussion, a federal judge held.In a written opinion Monday, U.S. District Judge Robert M. Dow Jr. ruled Chicago police officer Bogdan Medenica is shielded from John Ploski’s excessive force claim by qualified immunity.But Dow wrote Ploski is not necessarily left without a claim.Ploski may have a viable claim for battery under Illinois law, Dow wrote.In August 2016, Ploski attended …