No longer file:allocate CQv2 index files #4735
Merged
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As discussed on Slack following #4721.
This is both an alternative fix for #4721 and an improvement to the way v2 index segment files are handled: we no longer pre-allocate the files, so there is no platform differences anymore (there was for at least Windows and FreeBSD+ZFS), and the files do not unnecessarily take space on disk.