chore: sync vendor/zoekt with upstream sourcegraph/zoekt

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+- Synced `vendor/zoekt` with upstream `sourcegraph/zoekt`. [#1140](https://github.com/sourcebot-dev/sourcebot/pull/1140)
+
 ## [4.16.12] - 2026-04-20
 
 ### Fixed

packages/backend/src/zoekt.ts

@@ -23,7 +23,7 @@ export const indexGitRepository = async (repo: Repo, settings: Settings, revisio
         `-branches "${revisions.join(',')}"`,
         `-tenant_id ${repo.orgId}`,
         `-repo_id ${repo.id}`,
-        `-shard_prefix ${shardPrefix}`,
+        `-shard_prefix_override ${shardPrefix}`,
         ...largeFileGlobPatterns.map((pattern) => `-large_file "${pattern}"`),
         repoPath
     ].join(' ');