Get Sprint Name for Issue

    

        
        
        
            
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    // The issue key
final issueKey = 'TEST-1'

// Fetch the issue object from the key
def fields = get("/rest/agile/1.0/issue/${issueKey}")
    .header('Content-Type', 'application/json')
    .asObject(Map)
    .body
    .fields as Map

// Get sprint field from the issue fields as a Map
def sprint = fields.sprint as Map

// Get the Custom field to get the option value from
def sprintName = sprint.name // Note change .name to .id to get the ID of the sprint.

"The name of the current Sprint is '${sprintName}'"