Can a node run more than one optimize concurrently

I'm sending a REST call to optimize several indices together:,index2,index3/_optimize?max_num_segments=1&force=true

looking at the segments on disk, it is evident that the node optimizes one
index at a time (finishes the rist, and then starts the next).
More than that, it sometimes optimizes 1-3 indices and then stops.

Is there a way to tell the node to optimize several indices concurrently?
(the machine has 16 CPUs)


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