code: public synchronized <ApiType, ApiListType> SharedIndexInformer<ApiType> sharedIndexInformerFor(
        Function<CallGeneratorParams, Call> callGenerator,
        Class<ApiType> apiTypeClass,
        Class<ApiListType> apiListTypeClass) {
      return sharedIndexInformerFor(callGenerator, apiTypeClass, apiListTypeClass, 0);
    }
docs: Shared index informer for shared index informer.
  
  @param <ApiType> the type parameter
  @param <ApiListType> the type parameter
  @param callGenerator the call generator
  @param apiTypeClass the api type class
  @param apiListTypeClass the api list type class
  @return the shared index informer