The ClusterStats datatype includes various settings.

Table: ClusterStats

compressedByteSizelongyes The compression byte size for cluster statistics.
uncompressedByteSizelongyes The uncompressed byte size of cluster statistics.
compressedByteSizeOfMergedlongyes The compressed byte size for merged cluster statistics.
uncompressedByteSizeOfMergedlongyes The uncompressed byte size for merged cluster statistics.

[a] Some arguments may be required, as indicated in this column. For some fields, this column indicates that a result will always be returned for it.