[BUG] Vector search backfill missing

[jieguangzhou]

System Information

main

What happened?

When building and using vector_search in one single thread, there is no issue because it is populated by other functions.

However, when starting a new process and loading vector_search, we get an empty vector_search.

Steps to reproduce

No response

Relevant log output

No response

[kartik4949]

PR in progress

[luisortz]

✅ Codebase setup completed successfully.

• Dockerfile created and validated
• Logger import fixed for loki handler
• Tests passing (59 total)
  Related PR: chore(dev): codebase setup for issue #2395 #2926