Elasticsearch query returns incorrect highlight

Summary

When searching for the string cvss on gitlab.com/gitlab-org the wrong string was highlighted. The search string is actually present within the file but the highlighted portion did not match and the search preview did not include that portion of the string

Steps to reproduce

• Search https://gitlab.com/search?group_id=2564205&project_id=&repository_ref=&scope=blobs&search=cvss
• File in question: https://gitlab.com/gitlab-org/security-products/analyzers/spotbugs/raw/5637cfb1383375ea0c3912d41d22d45d4e09d7e6/test/fixtures/grails-project/grails-app/assets/javascripts/bootstrap.bundle.min.js.map

Example Project

See above, this bug happens on gitlab.com

What is the current bug behavior?

Incorrect string is highlighted/displayed

What is the expected correct behavior?

Search string is highlighted/displayed

Relevant logs and/or screenshots

Output of checks

This bug happens on GitLab.com

Results of GitLab environment info

Expand for output related to GitLab environment info

(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:env:info)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production)

Results of GitLab application Check

Expand for output related to the GitLab application check

(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:check SANITIZE=true)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true)
(we will only investigate if the tests are passing)

Possible fixes

(If you can, link to the line of code that might be responsible for the problem)