[7.x] Add maintenance service to clean up unused docs in snapshot blob cache #78263
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elastic#77686) Today we use the system index .snapshot-blob-cache to store parts of blobs and to avoid to fetch them again from the snapshot repository when recovering a searchable snapshot shard. This index is never cleaned up though and because it's a system index users won't be able to clean up manually in the future. This commit adds a BlobStoreCacheMaintenanceService which detects the deletion of searchable snapshot indices and triggers the deletion of associated documents in .snapshot-blob-cache.
tlrx
added
backport
auto-merge-without-approval
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Today we use the system index .snapshot-blob-cache to
store parts of blobs and to avoid to fetch them again from
the snapshot repository when recovering a searchable
snapshot shard. This index is never cleaned up though
and because it's a system index users won't be able to
clean up manually in the future.
This commit adds a BlobStoreCacheMaintenanceService
which detects the deletion of searchable snapshot indices
and triggers the deletion of associated documents in
.snapshot-blob-cache.
Backport of #77686