[7.15] Properly apply system flag on data streams when restoring a snapshot #75855
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elastic#75819) This commit modifies the restore process to ensure that the `system` flag is properly applied to restored data streams. Otherwise, this flag is lost when restoring system data streams, which causes errors and/or assertion failures as the backing indices are properly marked as system indices, but the restored data stream is no longer a system data stream. Also adds a test to ensure this flag survives a round trip through the snapshot/restore process.
gwbrown
added
backport
auto-merge-without-approval
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This commit modifies the restore process to ensure that the
systemflag is properly applied to restored data streams. Otherwise, this
flag is lost when restoring system data streams, which causes errors
and/or assertion failures as the backing indices are properly marked
as system indices, but the restored data stream is no longer a
system data stream.
Also adds a test to ensure this flag survives a round trip through
the snapshot/restore process.
Backport of #75819