Minecraft wiki entry for Absorption, associated text: Through use of commands, the player can achieve 1064 × 532 health points — the maximum amount possible to obtain without attributes — using a combination of Absorption and Health Boost.
A player who gets max health using the method above, and then adds Regeneration with the level of 255 while healing to 1034 hearts, sees the view jolt, even in Creative mode[verify], as if taking damage. This also happens when the effect ends.