code: public static void configure(FluoConfiguration fluoConfig, Options opts) {
      org.apache.fluo.recipes.core.combine.CombineQueue.FluentOptions cqopts =
          CombineQueue.configure(opts.mapId).keyType(opts.keyType).valueType(opts.valueType)
              .buckets(opts.numBuckets);
      if (opts.bucketsPerTablet != null) {
        cqopts.bucketsPerTablet(opts.bucketsPerTablet);
      }
      if (opts.bufferSize != null) {
        cqopts.bufferSize(opts.bufferSize);
      }
      cqopts.save(fluoConfig);
  
      opts.save(fluoConfig.getAppConfiguration());
  
      fluoConfig.addObserver(new org.apache.fluo.api.config.ObserverSpecification(
          CollisionFreeMapObserver.class.getName(), ImmutableMap.of("mapId", opts.mapId)));
    }
docs: This method configures a collision free map for use. It must be called before initializing
  Fluo.