Remove tab with dissect filter

I use dissect plugin for this esample of data file:
--- begin file ---

14.76.162.112 # 2018-04-01
--- end file ---

With this filter

filter {
   dissect {
      mapping => {
        "message" => "%{ip}  # %{date}"
      }
   }
  }

This is the result

{"@timestamp":"2018-04-16T21:21:31.972Z","message":"112.111.191.14\t\t\t # 2018-04-07, "ip":"112.111.191.14\t\t\t","date":"2018-04-07"}

How can I remove the tab character?

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