He began the 2021 season on the injured list with a knee injury and underwent surgery in May, forcing him to miss the whole season. He was assigned to the Indianapolis Indians of the Triple-A International League for the 2022 season. Over thirty games (14 starts), he went 4-2 with a 3.09 ERA and 82 strikeouts over innings. Bolton was assigned to Indianapolis to begin the 2023 season, where he made 8 appearances and posted a 2.38 ERA with 14 strikeouts in 11.1 innings pitched.
