contrib/src/test/resources/logSchema.json

{
  "fields": [{
    "field": "host",
    "regex": "^([0-9.]+)"
  }, {
    "field": "userName",
    "regex": "([a-zA-Z0-9_-]{1,16})"
  }, {
    "field": "statusCode",
    "regex": "(\\d{3})"
  }, {
    "field": "bytes",
    "regex": "(\\d+|-)"
  }]
}