protected InternalIndexStatistics createExplicitStats(String indexName) {
    return new PartitionedIndexStatistics(indexName);
  }
This will create extra {@link IndexStatistics} statistics for MapType PartitionedIndex.

@return new PartitionedIndexStatistics
geode-core/src/main/java/org/apache/geode/cache/query/internal/index/PartitionedIndex.java