public String toString() {
      return "No Keys = " + getNumberOfKeys() + "\n"
          + "No Map Index Keys = " + getNumberOfMapIndexKeys() + "\n"
          + "No Values = " + getNumberOfValues() + "\n"
          + "No Uses = " + getTotalUses() + "\n"
          + "No Updates = " + getNumUpdates() + "\n"
          + "Total Update time = " + getTotalUpdateTime() + "\n";
    }
Return the total number of times this index has been updated
geode-core/src/main/java/org/apache/geode/cache/query/internal/index/PartitionedIndex.java