builder.setQuery(QueryBuilders.matchAllQuery());
            }
            if (sortBuilders != null) {
                for (SortBuilder<?> sortBuilder : sortBuilders) {
                    builder.addSort(sortBuilder);
                }
            }
            if (from != null) {
                builder.setFrom(from);
            }
            if (size != null) {
                builder.setSize(size);

        protected void buildSort(final QueryContext queryContext, final QueryFieldConfig queryFieldConfig, final FessConfig fessConfig) {
            queryContext.sortBuilders().forEach(sortBuilder -> searchRequestBuilder.addSort(sortBuilder));
        }

        protected void buildRescorer(final QueryHelper queryHelper, final QueryFieldConfig queryFieldConfig, final FessConfig fessConfig) {

}

// syncToAllPeers is used for syncing local data to all remote peers, it is
// called once during initial "AddPeerClusters" request.
func (c *SiteReplicationSys) syncToAllPeers(ctx context.Context, addOpts madmin.SRAddOptions) error {
	objAPI := newObjectLayerFn()
	if objAPI == nil {
		return errSRObjectLayerNotReady
	}

	buckets, err := objAPI.ListBuckets(ctx, BucketOptions{})
	if err != nil {