elasticsearch-js/docs/reference/api/IndicesForcemergeForceMergeResponseBody.md

IndicesForcemergeForceMergeResponseBody [interface-IndicesForcemergeForceMergeResponseBody]

Name	Type	Description
task	string	task contains a task id returned when wait_for_completion=false, you can use the task_id to get the status of the task at _tasks/ < task_id >