Check aliases | Elasticsearch API documentation

indexstring | array[string] Required
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.
namestring | array[string] Required
Comma-separated list of aliases to check. Supports wildcards (*).

allow_no_indicesboolean
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_wildcardsstring | 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. Valid values are: all, open, closed, hidden, none.
Values are all, open, closed, hidden, or none.
ignore_unavailableboolean
If false, requests that include a missing data stream or index in the target indices or data streams return an error.
master_timeoutstring
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.
Values are -1 or 0.

HEAD /{index}/_alias/{name}

HEAD _alias/my-alias

resp = client.indices.exists_alias(
    name="my-alias",
)

const response = await client.indices.existsAlias({
  name: "my-alias",
});

response = client.indices.exists_alias(
  name: "my-alias"
)

$resp = $client->indices()->existsAlias([
    "name" => "my-alias",
]);

curl --head -H "Authorization: ApiKey $ELASTIC_API_KEY" "$ELASTICSEARCH_URL/_alias/my-alias"