Minecraft wiki entry for Configured_feature, associated text: disk—Only if there is water at the current block, places blocks in a circular formation using the  radius and twice the  half_height blocks deep.
 state: The block to use.
Block state[show]
 radius: Int provider between 0 and 8.
Int provider[show]
 half_height: Value between 0 and 4.
 targets: The blocks to replace.
A block state.
Block state[show]