# Check aliases


**HEAD /{index}/_alias/{name}**

**All methods and paths for this operation:**

<div>
                      <span class="operation-verb head">HEAD</span>
                      <span class="operation-path">/_alias/{name}</span>
                      </div>
                    <div>
                      <span class="operation-verb head">HEAD</span>
                      <span class="operation-path">/{index}/_alias/{name}</span>
                      </div>
                    

Check if one or more data stream or index aliases exist.


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


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


## Parameters

### Path parameters
- **index** (string | array[string])
  Comma-separated list of data streams or indices used to limit the request. Supports wildcards (`*`).
  To target all data streams and indices, omit this parameter or use `*` or `_all`.
- **name** (string | array[string])
  Comma-separated list of aliases to check. Supports wildcards (`*`).

### Query parameters
- **allow_no_indices** (boolean)
  If `false`, the request returns an error if any wildcard expression, index alias, or `_all` value targets only missing or closed indices.
  This behavior applies even if the request targets other open indices.
- **expand_wildcards** (string | array[string])
  Type of index that wildcard patterns can match.
  If the request can target data streams, this argument determines whether wildcard expressions match hidden data streams.
  Supports comma-separated values, such as `open,hidden`.

  Supported values include:
    - `all`: Match any data stream or index, including hidden ones.
    - `open`: Match open, non-hidden indices. Also matches any non-hidden data stream.
    - `closed`: Match closed, non-hidden indices. Also matches any non-hidden data stream. Data streams cannot be closed.
    - `hidden`: Match hidden data streams and hidden indices. Must be combined with `open`, `closed`, or `both`.
    - `none`: Wildcard expressions are not accepted.

- **ignore_unavailable** (boolean)
  If `false`, requests that include a missing data stream or index in the target indices or data streams return an error.
- **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.


## Responses
### 200



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