diff --git a/docusaurus.config.js b/docusaurus.config.js
index f3a2f8e84e..925f8ce8a1 100644
--- a/docusaurus.config.js
+++ b/docusaurus.config.js
@@ -244,6 +244,11 @@ const config = {
         appId: 'IYIBF1DKO0',
         apiKey: 'bd5089d395bb02b42c90304ead050cdf',
         indexName: 'docs',
+        // The former version prefix has redirect HTML but no client-side route.
+        replaceSearchResultPathname: {
+          from: /^\/docs\/2\.0\//,
+          to: '/docs/',
+        },
       },
     }),
 };
diff --git a/package.json b/package.json
index 97fe2fd5f3..d1b3723d9c 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
     "postinstall": "patch-package",
     "prestart": "node scripts/check-dependency-security.js",
     "start": "docusaurus start",
-    "build": "npm run check:dependency-security && npm run check:node-toolchain && docusaurus build && node scripts/generate-llms.js && node scripts/generate-llms-full.js",
+    "build": "npm run check:dependency-security && npm run check:node-toolchain && node scripts/search-navigation.test.js && docusaurus build && node scripts/generate-llms.js && node scripts/generate-llms-full.js",
     "check:node-toolchain": "node scripts/check-node-toolchain.js && node scripts/check-node-toolchain.test.js",
     "check:dependency-security": "node scripts/check-dependency-security.js && node scripts/check-dependency-security.test.js",
     "check:platform-protocol-specs": "node scripts/check-platform-protocol-specs.js",
diff --git a/scripts/search-navigation.test.js b/scripts/search-navigation.test.js
new file mode 100644
index 0000000000..d4166da526
--- /dev/null
+++ b/scripts/search-navigation.test.js
@@ -0,0 +1,29 @@
+const assert = require('node:assert/strict');
+const {validateThemeConfig} = require('@docusaurus/theme-search-algolia');
+const {themeConfig} = require('../docusaurus.config');
+
+// Exercise Docusaurus's normalization, which treats string matchers as literals.
+const value = validateThemeConfig({
+  themeConfig: {algolia: themeConfig.algolia},
+  validate(schema, input) {
+    const result = schema.validate(input);
+    assert.ifError(result.error);
+    return result.value;
+  },
+});
+const replacement = value.algolia.replaceSearchResultPathname;
+assert.ok(replacement, 'Search must resolve the former 2.0 route prefix');
+
+for (const [input, expected] of [
+  ['/docs/2.0/monitoring/', '/docs/monitoring/'],
+  ['/docs/2.0/waterline-operator-api/#operator-actions', '/docs/waterline-operator-api/#operator-actions'],
+  ['/docs/2.0/features/cancel-and-terminate/?q=test#waterline', '/docs/features/cancel-and-terminate/?q=test#waterline'],
+  ['/docs/1.x/monitoring/', '/docs/1.x/monitoring/'],
+  ['/docs/monitoring/', '/docs/monitoring/'],
+  ['/docs/2x0/monitoring/', '/docs/2x0/monitoring/'],
+  ['/search/?q=/docs/2.0/monitoring/', '/search/?q=/docs/2.0/monitoring/'],
+]) {
+  assert.equal(input.replaceAll(new RegExp(replacement.from, 'g'), replacement.to), expected);
+}
+
+console.log('Search navigation preserves canonical, archived, query and anchor routes.');