检查脚本本身中的空字段。如果该字段不存在，则首先创建
POST test3/_update/30RaAG0BY3127H1HaOEv
{
"script": {
"lang": "painless",
"inline": "if(!ctx._source.containsKey('comments')){ctx._source['comments']=[]}ctx._source.comments.add(params.object)",
"params": {
"object": {
"model": "tata nano",
"value": "2"
}
}
}
}
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