ElasticSearch，对已存在的索引，新增字段，并设置默认值

1、 新增字段 ( weight, 类型为整型 )

PUT s_person/_mapping/_doc?include_type_name=true
{
    "properties": {
        "weight": {
            "type": "integer"
        }
    }
}

2、 设置默认值 ( 设置 weitgh 默认为1 )

POST s_person/_doc/_update_by_query
{
    "script": {
        "lang": "painless",
        "inline": "ctx._source.weight = 1"
    }
}

或

POST s_person/_doc/_update_by_query
{
    "script":{
        "lang":"painless",
        "source":"if (ctx._source.weight == null) {ctx._source.weight = 1}"
    }
}