hierarchical JSON in log about loghouse HOT 2 OPEN

original:
{
  "message": "som message"
  "context": {
    "path":"/",
    "username":"admin"
  }
  "params": ["green", "red", "blue" ]
}


resulting string_fields:

message = "som message"
context.path = "/"
context.username="admin"
params.0 = "green"
params.1 = "red"
params.2 = "blue"