}

    public interface SearchCondition<B> {
        boolean build(B requestBuilder);
    }

    public interface SearchResult<T, B, R> {
        T build(B requestBuilder, long execTime, OptionalEntity<R> response);
    }

    public interface EntityCreator<T, R, H> {
        T build(R response, H hit);
    }

    public void setClusterName(final String clusterName) {

            builder.setQuery(parameter.getQuery());
            stream(parameter.getSuggestFields()).of(stream -> stream.forEach(builder::addField));
            roleQueryHelper.build(SearchRequestType.SUGGEST).stream().forEach(builder::addRole);
            builder.setSize(parameter.getNum());
            stream(langs).of(stream -> stream.forEach(builder::addLang));