We are using Jira Integration to get most of the Jira fields value. But somehow "Resolved" date field is not coming in response for Jira type as Bug.
Appreciate your suggestions.
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Jira fields can be weird, but they're part of what adds the customizability to Jira.
If Jira has an official field that says "Resolved", it will show up in the API JSON as "Resolved".
If your Jira Admin or project team added a custom field called "Resolved", it will show up as "customField123456" in the JSON. There is an API which gives the fields for a project, which should then tell you want custom field id you want.
On a past project, I solved some of these nuances by having Appian sync'ed records that were backed by an integration call to Jira's API's for project and issue type.