-[Environment variables](environment_variables.md): Supported environment variables that can be used to override their defaults values in order to configure GitLab.
-[Plugins](plugins.md): With custom plugins, GitLab administrators can introduce custom integrations without modifying GitLab's source code.
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-**(Starter/Premium)**[Elasticsearch](../integration/elasticsearch.md): Enable Elasticsearch to empower GitLab's Advanced Global Search. Useful when you deal with a huge amount of data.