Move clauses from query to filter stage for elasticsearch notes

What does this MR do?

Move clauses from the query stage to the filter stage, when searching notes with elasticsearch, improving search performance and avoiding a hardcoded limit on clause count.

Are there points in the code the reviewer needs to double check?

I don't know how we can test for this without creating 1025 projects in a spec - and that would be too slow :(

Why was this MR needed?

Previous partial fix solved this problem for issues, but not notes: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1282/diffs

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Tests
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #1776 (closed)