public IndexStore getIndexStorage() {
    return indexStore;
  }
A CompactRangeIndex is a range index that has simple data structures to minimize its footprint,
at the expense of doing extra work at index maintenance. It is selected as the index
implementation when the indexed expression is a path expression and the from clause has only one
iterator. This implies there is only one value in the index for each region entry.

This index does not support the storage of projection attributes.

Currently this implementation only supports an index on a region path.

@since GemFire 6.0
geode-core/src/main/java/org/apache/geode/cache/query/internal/index/CompactRangeIndex.java