Add missing search-api Learn to Rank alert document

alphagov · Nov 28, 2022 · 80be75b · 80be75b
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diff --git a/source/manual/alerts/search-api-learn-to-rank.html.md b/source/manual/alerts/search-api-learn-to-rank.html.md
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+---
+owner_slack: "#govuk-2ndline-tech"
+title: Train and deploy LTR model for Search API
+parent: "/manual.html"
+layout: manual_layout
+section: Icinga alerts
+---
+
+[Search API](/repos/search-api.html) uses a machine learning tool called Learn to Rank (LTR) to improve search result relevance. This uses the TensorFlow Ranking module.
+
+On occassion the current ranking becomes out of date and the tool needs to be re-trained. There are [several rake tasks](/repos/search-api/learning-to-rank.html) to accomplish this.