default Optional<String> getAlias() {
        return getAsString(HasAliasUtil.ALIAS);
    }
Returns the alias of the specified document. The alias is an optional
string value located under the {@link HasAliasUtil#ALIAS} key.

@return  the alias or an empty {@code Optional} if none was specified
runtime-parent/runtime-config/src/main/java/com/speedment/runtime/config/trait/HasAlias.java