# Create or update an alias

**POST /_aliases**

Adds a data stream or index to an alias.


## Servers
- http://api.example.com: http://api.example.com ()


## Authentication methods
- Api key auth
- Basic auth
- Bearer auth


## Parameters


### Query parameters
- **master_timeout** (string)
  Period to wait for a connection to the master node.
  If no response is received before the timeout expires, the request fails and returns an error.
- **timeout** (string)
  Period to wait for a response.
  If no response is received before the timeout expires, the request fails and returns an error.

### Body: application/json (object)

- **actions** (array[object])
  Actions to perform.


## Responses
### 200


#### Body: application/json (object)
- **acknowledged** (boolean)
  For a successful response, this value is always true. On failure, an exception is returned instead.


[Powered by Bump.sh](https://bump.sh)