Painless script可以用来更新或新增field到一个document中， 下面是范例代码：
带参数更新
POST v2_tmm/doc/6SGjpWMBOloH49RB8o2r/_update
{
"script": {
"lang": "painless",
"source": "ctx._source.vid=333; ctx._source.first=params.first",
"params": {
"first": "aln",
"last": "zhou"
}
}
}
https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-update-by-query.html
更新查询后的记录：
POST base_data/_update_by_query
{
"script": {
"source": "ctx._source.userid='updateduser'",
"lang": "painless"
},
"query": {
"match" : {
"userid" : ""
}
}
}
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