presto-elasticsearch/src/main/java/io/prestosql/elasticsearch/ElasticsearchSplit.java/ElasticsearchSplit/getAddresses
class ElasticsearchSplit:    @Override
    public List<HostAddress> getAddresses()
    {
        return address.map(host -> ImmutableList.of(HostAddress.fromString(host)))
                .orElseGet(ImmutableList::of);
    }