David E. Kelley has produced more than 40 series in his TV career. His latest, however, is a marked departure from the prolific showrunner’s usual material. Kelley is executive producing a nature documentary called Live Migrations, teaming with series creator Tucker Malarkey on the project. The emphasis of Live Migrations is the “live” part — launching Wednesday on a dedicated website and YouTube channel, the series will follow animal migrations in real time. The first production is The Great Sockeye Migration, following sockeye salmon as they return to Bristol Bay, Alaska. “Live Migrations allows you to slow down and connect with nature…