> ## Documentation Index
> Fetch the complete documentation index at: https://doc.lucidworks.com/llms.txt
> Use this file to discover all available pages before exploring further.

# System Admin APIs

[localhost link]: http://localhost:3000/docs/4/fusion-server/reference/api/system-admin-apis/overview

[mintlify link]: https://doc.lucidworks.com/docs/4/fusion-server/reference/api/system-admin-apis/overview

[old doc.lw link]: https://doc.lucidworks.com/fusion-server/4.2/347

The System Admin APIs are REST API endpoints that can be used by a system administrator to configure various Fusion processes. The REST APIs are:
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* [Configurations API](/docs/4/fusion-server/reference/api/system-admin-apis/configurations-api), to check and modify global settings in Fusion.
* [History API](/docs/4/fusion-server/reference/api/system-admin-apis/history-api), to retrieve historic events of each service in the system.
* [Nodes API](/docs/4/fusion-server/reference/api/system-admin-apis/nodes-api), to check the status of each node in the search cluster.
* [System API](/docs/4/fusion-server/reference/api/system-admin-apis/system-api), to retrieve system metrics, ping the system for life, flush buffers, or view active threads.
* [Usage API](/docs/4/fusion-server/reference/api/system-admin-apis/usage-api), to retrieve system information that is shared with Lucidworks about the size of your system.