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Elasticsearch overload from suspected botnet traffic degraded search across GitHub

GitHub's Elasticsearch cluster became overloaded due to load that engineers later attributed to suspected botnet activity. Search-backed UI surfaces, including Issues, Pull Requests, Projects, Actions workflow runs, and Packages, returned timed-out or empty results. Engineers identified the source of the additional load and disabled it, allowing the cluster to recover. After the cluster stabilized, GitHub had to reindex Pull Request data, with reindexing continuing into the following days.