Searches that includes custom fields have no results

Summary

Searches that includes custom fields have no results.
Also ordering search results by custom fields have no effect.

Steps to Reproduce

1. Run your_custom_field = existing_value
2. Run your_custom_field is EMPTY
3. Run your_custom_field is not EMPTY
4. Run order by your_custom_field

Expected Results

Searches should return the corresponding issues.

Actual Results

No result is returned

Workaround

1. Go to custom fields page.
2. Click on the cog next to the custom field > Configure.
3. Edit the context > save the changes.
4. Change back the settings of the context > save the changes.

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