@Override
    public Long evictExpiredElements(final FindCacheInfoCriteria criteria) {
        return doCacheAction(criteria, StroomCache::evictExpiredElements);
    }
Clears all items from named cache and rebuilds the cache from config
stroom-cache/stroom-cache-service-impl/src/main/java/stroom/cache/service/impl/CacheManagerServiceImpl.java