The query API returns a comma at the front of the array.
[,{"@timestamp":1529941532194,"#type":"kv","@error":"true","@error_msg":"Error parsing timestamp. errormsg=\"Text 'k3=3' could not be parsed at index 0\" string=\"k3=3\" zone...","@timezone":"Z","k3":"3","@rawstring":"k3=3","@event_parsed":"false","@id":"olN6vXICsGcObL6HN7Dh4PEG_52_0"}]
The query API returns a comma at the front of the array.