public List<ConfigSynonym> synonyms() {
        return  synonyms;
    }
Returns all config values that may be used as the value of this config along with their source,
in the order of precedence. The list starts with the value returned in this ConfigEntry.
The list is empty if synonyms were not requested using {@link DescribeConfigsOptions#includeSynonyms(boolean)}
clients/src/main/java/org/apache/kafka/clients/admin/ConfigEntry.java