@Override
    public long getNumberOfValues(Object key) {
      long numValues = 0;
      for (Object ind : mapKeyToValueIndex.values()) {
        numValues += ((Index) ind).getStatistics().getNumberOfValues(key);
      }
      return numValues;
    }
Return the total number of times this index has been updated
geode-core/src/main/java/org/apache/geode/cache/query/internal/index/AbstractMapIndex.java