||A set of Ziplines files, which are CDX files specially compressed into a
series of GZipMembers such that:
1) each member is exactly 128K, padded using a GZip comment header
2) each member contains complete lines: no line spans two GZip members
If the data put into these files is sorted, then the data within the files
can be uncompressed when needed, minimizing the total data to be uncompressed
This SearchResultSource assumes a set of alphabetically partitioned Ziplined
CDX files, so that each file is sorted, and no regions overlap.