Steps to reproduce (assumes ChromeVox or similar)

1. Visit the Rollup Jobs listing page (make sure it has data)
2. Tab to the checkboxes on the left

Actual Result

4. Screen reader reads "checkbox not checked"

Expected Result

4. Screen reader should read "select [name of rollup job]"

Meta Issue #26862

Kibana Version: 6.5

Relevant WCAG Criteria: 3.3.2 Labels or Instructions