Get fields, Resolutions, and Issue Types from Jira

// Name of the elements for which you want to get the id
def issueTypesNames = ['Story']
def fieldNames = ['Summary']
def resolutionNames = ['Done']

// Elements information maps
def issueTypesMap = getIssueTypeIdsFromNames(issueTypesNames)
def fieldsMap = getFieldIdsFromNames(fieldNames)
def resolutionsMap = getResolutionsFromNames(resolutionNames)

"IssueTypes: ${issueTypesMap} - Fields: ${fieldsMap} - Resolutions: ${resolutionsMap}"

Map<String, String> getIssueTypeIdsFromNames(Collection<String> issueTypesNames) {
    def result = issueTypesNames.collectEntries { issueTypeName ->
        def issueTypeObject = get('/rest/api/2/issuetype')
                .asObject(List)
                .body.find {
            (it as Map).name == issueTypeName
        } as Map

        issueTypeObject ? [(issueTypeName.toString()): issueTypeObject.id] : [:]
    }
    result as Map<String, String>
}

Map<String, String> getFieldIdsFromNames(Collection<String> fieldNames) {
    def result = fieldNames.collectEntries { fieldName ->
        def customFieldObject = get('/rest/api/2/field')
                .asObject(List)
                .body.find {
            (it as Map).name == fieldName
        } as Map

        customFieldObject ? [(fieldName.toString()): customFieldObject.id] : [:]
    }
    result as Map<String, String>
}

Map<String, String> getResolutionsFromNames(Collection<String> resolutionNames) {
    def result = resolutionNames.collectEntries { resolutionName ->
        def resolutionObject = get('/rest/api/2/resolution')
                .asObject(List)
                .body.find {
            (it as Map).name == resolutionName
        } as Map

        resolutionObject ? [(resolutionName.toString()): resolutionObject.id] : [:]
    }
    result as Map<String, String>
}