grib/src/main/java/ucar/nc2/grib/collection/GribCdmIndex.java
public static File getTopIndexFileFromConfig(FeatureCollectionConfig config) {
    File indexFile = makeTopIndexFileFromConfig(config);
    return GribIndexCache.getExistingFileOrCache(indexFile.getPath());
  }
public static File getTopIndexFileFromConfig(FeatureCollectionConfig config) {
    File indexFile = makeTopIndexFileFromConfig(config);
    return GribIndexCache.getExistingFileOrCache(indexFile.getPath());
  }
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