code: public LandmarkStorage setLandmarkSuggestions(List<LandmarkSuggestion> landmarkSuggestions) {
          if (landmarkSuggestions == null)
              throw new IllegalArgumentException("landmark suggestions cannot be null");
  
          this.landmarkSuggestions = landmarkSuggestions;
          return this;
      }
docs: This method forces the landmark preparation to skip the landmark search and uses the specified landmark list instead.
  Useful for manual tuning of larger areas to safe import time or improve quality.