新增字段
PUT 索引名称/_mapping/doc

PUT activity_v1/_mapping/doc {        "properties": {       "effDate_fbda": {        "type": "text"      },     "expDate_fbda": {      "type": "text"     }     }}

对新增字段赋值
POST 索引名称/_update_by_query

 POST activity_v1/_update_by_query{  "script": {    "source": "ctx._source.expDate_fbda=ctx._source.expDate"   }}