# `IndicesPutSettingsRequest` [interface-IndicesPutSettingsRequest]

| Name | Type | Description |
| - | - | - |
| `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. For example, a request targeting `foo*,bar*` returns an error if an index starts with `foo` but no index starts with `bar`. |
| `body` | string | ({ [key: string]: any; } & { index?: never; allow_no_indices?: never; expand_wildcards?: never; flat_settings?: never; ignore_unavailable?: never; master_timeout?: never; preserve_existing?: never; reopen?: never; timeout?: never; settings?: never; }) | All values in `body` will be added to the request body. |
| `expand_wildcards` | [ExpandWildcards](./ExpandWildcards.md) | 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`. |
| `flat_settings` | boolean | If `true`, returns settings in flat format. |
| `ignore_unavailable` | boolean | If `true`, returns settings in flat format. |
| `index` | [Indices](./Indices.md) | Comma-separated list of data streams, indices, and aliases used to limit the request. Supports wildcards ( `*`). To target all data streams and indices, omit this parameter or use `*` or `_all`. |
| `master_timeout` | [Duration](./Duration.md) | 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. |
| `preserve_existing` | boolean | If `true`, existing index settings remain unchanged. |
| `querystring` | { [key: string]: any; } & { index?: never; allow_no_indices?: never; expand_wildcards?: never; flat_settings?: never; ignore_unavailable?: never; master_timeout?: never; preserve_existing?: never; reopen?: never; timeout?: never; settings?: never; } | All values in `querystring` will be added to the request querystring. |
| `reopen` | boolean | Whether to close and reopen the index to apply non-dynamic settings. If set to `true` the indices to which the settings are being applied will be closed temporarily and then reopened in order to apply the changes. |
| `settings` | [IndicesIndexSettings](./IndicesIndexSettings.md) |   |
| `timeout` | [Duration](./Duration.md) | Period to wait for a response. If no response is received before the timeout expires, the request fails and returns an error. |