128 lines
4.5 KiB
Markdown
128 lines
4.5 KiB
Markdown
---
|
||
layout: default
|
||
title: Clear cache
|
||
parent: Index APIs
|
||
nav_order: 10
|
||
---
|
||
|
||
# Clear cache
|
||
|
||
The clear cache API operation clears the caches of one or more indexes. For data streams, the API clears the caches of the stream’s backing indexes.
|
||
|
||
|
||
If you use the Security plugin, you must have the `manage index` privileges.
|
||
{: .note}
|
||
|
||
## Path parameters
|
||
|
||
| Parameter | Data type | Description |
|
||
:--- | :--- | :---
|
||
| target | String | Comma-delimited list of data streams, indexes, and index aliases to which cache clearing is applied. Wildcard expressions (`*`) are supported. To target all data streams and indexes in a cluster, omit this parameter or use `_all` or `*`. Optional. |
|
||
|
||
|
||
## Query parameters
|
||
|
||
All query parameters are optional.
|
||
|
||
| Parameter | Data type | Description |
|
||
:--- | :--- | :---
|
||
| allow_no_indices | Boolean | Whether to ignore wildcards, index aliases, or `_all` target (`target` path parameter) values that don’t match any indexes. If `false`, the request returns an error if any wildcard expression, index alias, or `_all` target value doesn't match any indexes. This behavior also applies if the request targets include other open indexes. For example, a request where the target is `fig*,app*` returns an error if an index starts with `fig` but no index starts with `app`. Defaults to `true`. |
|
||
| expand_wildcards | String | Determines the index types that wildcard expressions can expand to. Accepts multiple values separated by a comma, such as `open,hidden`. Valid values are: <br /><br /> `all` -- Expand to open, closed, and hidden indexes.<br /><br />`open` -- Expand only to open indexes.<br /><br />`closed` -- Expand only to closed indexes<br /><br />`hidden` -- Expand to include hidden indexes. Must be combined with `open`, `closed`, or `both`.<br /><br />`none` -- Expansions are not accepted.<br /><br /> Defaults to `open`. |
|
||
| fielddata | Boolean | If `true`, clears the fields cache. Use the `fields` parameter to clear specific fields' caches. Defaults to `true`. |
|
||
| fields | String | Used in conjunction with the `fielddata` parameter. Comma-delimited list of field names that are cleared out of the cache. Does not support objects or field aliases. Defaults to all fields. |
|
||
| file | Boolean | If `true`, clears the unused entries from the file cache on nodes with the Search role. Defaults to `false`. |
|
||
| index | String | Comma-delimited list of index names that are cleared out of the cache. |
|
||
| ignore_unavailable | Boolean | If `true`, OpenSearch ignores missing or closed indexes. Defaults to `false`. |
|
||
| query | Boolean | If `true`, clears the query cache. Defaults to `true`. |
|
||
| request | Boolean | If `true`, clears the request cache. Defaults to `true`. |
|
||
|
||
## Example requests
|
||
|
||
The following example requests show multiple clear cache API uses.
|
||
|
||
### Clear a specific cache
|
||
|
||
The following request clears the fields cache only:
|
||
|
||
```json
|
||
POST /my-index/_cache/clear?fielddata=true
|
||
```
|
||
{% include copy-curl.html %}
|
||
|
||
<hr />
|
||
|
||
The following request clears the query cache only:
|
||
|
||
```json
|
||
POST /my-index/_cache/clear?query=true
|
||
```
|
||
{% include copy-curl.html %}
|
||
|
||
<hr />
|
||
|
||
The following request clears the request cache only:
|
||
|
||
```json
|
||
POST /my-index/_cache/clear?request=true
|
||
```
|
||
{% include copy-curl.html %}
|
||
|
||
### Clear the cache for specific fields
|
||
|
||
The following request clears the fields caches of `fielda` and `fieldb`:
|
||
|
||
```json
|
||
POST /my-index/_cache/clear?fields=fielda,fieldb
|
||
```
|
||
{% include copy-curl.html %}
|
||
|
||
### Clear caches for specific data streams or indexes
|
||
|
||
The following request clears the cache for two specific indexes:
|
||
|
||
```json
|
||
POST /my-index,my-index2/_cache/clear
|
||
```
|
||
{% include copy-curl.html %}
|
||
|
||
### Clear caches for all data streams and indexes
|
||
|
||
The following request clears the cache for all data streams and indexes:
|
||
|
||
```json
|
||
POST /_cache/clear
|
||
```
|
||
{% include copy-curl.html %}
|
||
|
||
### Clear unused entries from the cache on search-capable nodes
|
||
|
||
```json
|
||
POST /*/_cache/clear?file=true
|
||
```
|
||
{% include copy-curl.html %}
|
||
|
||
#### Example response
|
||
|
||
The `POST /books,hockey/_cache/clear` request returns the following fields:
|
||
|
||
```json
|
||
{
|
||
"_shards" : {
|
||
"total" : 4,
|
||
"successful" : 2,
|
||
"failed" : 0
|
||
}
|
||
}
|
||
```
|
||
|
||
#### Response fields
|
||
|
||
The `POST /books,hockey/_cache/clear` request returns the following response fields:
|
||
|
||
| Field | Data type | Description |
|
||
:--- | :--- | :---
|
||
| _shards | Object | Shard information. |
|
||
| total | Integer | Total number of shards. |
|
||
| successful | Integer | Number of index shards with caches successfully cleared. |
|
||
| failed | Integer | Number of index shards with caches that failed to clear. |
|