Filbeats - remove ansi control characters for colored logs

filebeats-remove_ansi_coloring.yaml

    - script:
        when:
          regexp:
            message: "[\u001b\u009b][[()#;?]*(?:[0-9]{1,4}(?:;[0-9]{0,4})*)?[0-9A-ORZcf-nqry=><]"
        lang: javascript
        id: remove_ansi_color
        source: >
          function process(event) {
            var msg = event.Get("message")
            var regex = /[\u001b\u009b][[()#;?]*(?:[0-9]{1,4}(?:;[0-9]{0,4})*)?[0-9A-ORZcf-nqry=><]/g
            event.Put("message", msg.replace(regex, ''))
            event.Tag("ansi_color_removed")
          }