Called after player flushed fluid
player_index: uint32 — Index of the playerfluid: string — Name of a fluid that was flushedamount: double — Amount of fluid that was removedentity: LuaEntity — Entity from which flush was performedonly_this_entity: boolean — True if flush was requested only on this entityname: defines.events — Identifier of the eventtick: uint32 — Tick the event was generated.