# AOSPERF06-BP01 Identify index refresh controls for optimal ingestion performance
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 Improve indexing throughput and speed by adjusting the refresh\$1interval value to more than 30 seconds. 

 **Level of risk exposed if this best practice is not established:** Medium 

 **Desired outcome**: The refresh\$1interval value is set to more than 30 seconds, which could potentially lead to increased indexing throughput and faster indexing speeds. 

 **Benefits of establishing this best practice:** By adjusting the `refresh_interval`, you can optimize index write performance, as less frequent refreshes allow for more efficient ongoing writes which usually results as faster indexing speeds. 

## Implementation guidance
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 A refresh operation makes all updates to an index accessible for search. The default refresh interval is one second, indicating that OpenSearch Service performs a refresh every second during ongoing index writes. 

### Implementation steps
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+  Check the current `refresh_interval` value for your index. 

```
GET /<index-name>/_settings/index.refresh_interval
```
+  Change the `refresh_interval` value to 30s or more 

```
PUT /sample_data/_settings
        {
        "index" : {
        "refresh_interval" : "30s"
        }
        }
```
+ It is also possible to disable the automatic refreshes by setting `refresh_interval": "-1"`
+  If the `refresh_interval` is disabled, you can manually refresh an index running `POST <index-name>/_refresh`. 
+  If you're loading new data into your domain through a batch process, it might be beneficial to disable the automatic refresh just before the batch process begins, and re-enable it after the process concludes. 

## Resources
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+  [Optimize OpenSearch Refresh Interval](https://opensearch.org/blog/optimize-refresh-interval/)