Logstash. Mutate's split doesn't split string

Hi, community. I have field "temp" with this value: "2.4.3-371989". I want split it by dots. With this purpose I use mutate filter this way:

mutate {
  split => ["temp", "."]

But after split "temp" field still equals "2.4.3-371989".


Split option take a Hash not an Array.
Need to be like this :

mutate {
  split => { "temp" => "." }


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