def issue = issueManager.getIssueObject("TB-71916")
MutableIssue issueToUpdate = issue;

 if(issueToUpdate.getResolution().getName() != "Fixed") { 
    log.warn("Clean Fix version for ${issueToUpdate.key}") 
 // update with history and updating issue but without notification
    // issueToUpdate.setFixVersions(null);
    // issueManager.updateIssue(null, issueToUpdate,  EventDispatchOption.DO_NOT_DISPATCH, false)
    
    
    // update without fix notification
 def toClearFixField = customFieldManager.getCustomFieldObjectByName("Fix Version/s")
    log.warn(issueToUpdate.getCustomFieldValue(toClearFixField)) 
    toClearFixField.updateValue(null, issueToUpdate, new ModifiedValue(null, (Object) ""), new DefaultIssueChangeHolder())
}