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# HPE IDOL Search Optimizer Home Directory

You must specify the HPE IDOL Search Optimizer home directory as a Java system property, either in a startup script or within the appropriate application server configuration, depending on how the application is being deployed.

The home directory contains the following files:

- The HPE IDOL Search Optimizer configuration file (`config.json`). If this file is not found, HPE IDOL Search Optimizer generates a default configuration file when the application starts.

  You can edit the configuration file either from the Settings page in the application (recommended), or manually in a text editor. If you manually edit the file, you must restart HPE IDOL Search Optimizer for any configuration changes to take effect.

- The HPE IDOL Search Optimizer log file (`searchoptimizer.log`). This file records details of application events (for example, sending statistics updates to connected clients), login events (for example, when a specific user logs in successfully), and user actions (for example, when a specific user deletes a promotion). It also records application error messages where applicable.

  If you need to contact support, please include this log file when you send your query.

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