You can make the resolution field as mandatory on the close issue transition. You can do this by adding a postfunction in the workflow in the transition to Closed.
In the default workflow, this field resolution is anyway mandatory in the transition to Resolve issue.
See this link
https://confluence.atlassian.com/cloud/advanced-workflow-configuration-687219884.html#notfound
Pilar
This is a complex one.
Off the shelf, you can't quite do this by saying "make the field mandatory" as JIRA doesn't ship with the validators to check that the field is filled. You can install free addons to provide this validator. But you probably don't want to do it this way because there are better options:
You can also
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