Code search is not deterministic when logged in

Steps to reproduce

• execute code search a few times

Example Project

https://gitlab.com/search?group_id=9970&nav_source=navbar&project_id=278964&repository_ref=master&scope=blobs&search=vue&search_code=true

What is the current bug behavior?

number of results differs each time:

What is the expected correct behavior?

search results are the same each time