class AggregationServiceFallbackFactory implements FallbackFactory<AggregationService> {
    @Override
    public AggregationService create(Throwable throwable) {<FILL_FUNCTION_BODY>}
}

        return (indexName, routing) -> {
            log.error("通过索引{}搜索异常:{}", indexName, throwable);
            return MapUtil.newHashMap(0);
        };
    
<no_super_class>