原索引
PUT my_index
{
"mappings": {
"_doc": {
"properties": {
"create_date": {
"type": "date",
"format": "yyyy-MM-dd ||yyyy/MM/dd"
}
}
}
}
}
　　二、创建新索引
PUT my_index2
{
"mappings": {
"_doc": {
"properties": {
"create_date": {
"type": "text"
}
}
}
}
}
　　三、同步数据

POST _reindex
{
"source": {
"index": "my_index"
},
"dest": {
"index": "my_index2"
}
}
　　四、删除原索引

DELETE my_index
　　五、设置别名

POST /_aliases
{
"actions": [
{"add": {"index": "my_index2", "alias": "my_index"}}
]
}

#######
POST _reindex
{
"source": {
"index": "t1"
},
"dest": {
"index": "t2",
"version_type": "external"
},
"script": {
"source":"def w = ctx._source.remove('weight');ctx._source.weight=w;",
"lang": "painless"
}
}