opensearch-docs-cn/_dashboards/im-dashboards/forcemerge.md

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---
layout: default
title: Force merge
parent: Index management in Dashboards
nav_order: 30
redirect_from:
- /dashboards/admin-ui-index/forcemerge/
---
# Force merge
Introduced 2.6
{: .label .label-purple }
OpenSearch Dashboards allows you to perform a [force merge]({{site.url}}{{site.baseurl}}/im-plugin/ism/error-prevention/index#force_merge) operation on two or more indexes with **Index Management**.
## Force merging indexes
To perform a force merge operation on two or more indexes, perform the following steps:
1. Under **Index Management**, choose **Indices**.
1. Select the indexes you want to force merge.
1. Choose **Actions**, and then choose **Force merge**, as shown in the following image.
![Force Merge]({{site.url}}{{site.baseurl}}/images/admin-ui-index/forcemerge1.png)
1. Under **Configure source index**, specify the indexes you want to force merge.
1. Optionally, under **Advanced settings** you can to choose to **Flush indices** or **Only expunge delete** and then specify the **Max number of segments** to merge to as shown in the following image.
![Force Merge]({{site.url}}{{site.baseurl}}/images/admin-ui-index/forcemerge2.png)
## Force merging data streams
To perform a force merge operation on two or more indexes, perform the following steps:
1. Under **Index Management**, choose **Data streams**.
1. Select the data streams you want to force merge.
1. Choose **Actions**, and then choose **Force merge**.
1. Under **Configure source index**, specify the data streams you want to force merge.
1. Optionally, under **Advanced settings** you can to choose to **Flush indices** or **Only expunge delete** and then specify the **Max number of segments** to merge to as shown in the following image.
![Force Merge]({{site.url}}{{site.baseurl}}/images/admin-ui-index/forcemerge2.png)