in src/main/groovy/com/epam/esp/jira/issue/AbstractBaseIssueProcessor.groovy [37:47]
def getMultiFieldValues(SearchHit searchHit, String fieldName) {
def field = searchHit.sourceAsMap.fields[fieldName]
if (field != null) {
List<String> result = new ArrayList<String>()
field.each {
result.add(it.value)
}
result.sort()
return result.join('+')
} else return UNKNOWN
}