“Halftime” could have just as easily been titled “The Importance of Being J-Lo,” focusing on Jennifer Lopez’s life and career, somewhat arbitrarily, through a particularly busy, high-profile stretch in 2019 and early 2020. Although the documentary fritters around the edges of being interesting, it’s too much of a licensed product to deliver any grand insights.“Halftime” could have just as easily been titled “The Importance of Being J-Lo,” focusing on Jennifer Lopez’s life and career, somewhat arbitrarily, through a particularly busy, high-profile stretch in 2019 and early 2020. Although the documentary fritters around the edges of being interesting, it’s too much of a licensed product to deliver any grand insights.