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* Split searchable snapshot into multiple repo operations Each operation on a snapshot repository uses the same `Repository`, `BlobStore`, etc. instances throughout, in order to avoid the complexity arising from handling metadata updates that occur while an operation is running. Today we model the entire lifetime of a searchable snapshot shard as a single repository operation since there should be no metadata updates that matter in this context (other than those that are handled dynamically via other mechanisms) and some metadata updates might be positively harmful to a searchable snapshot shard. It turns out that there are some undocumented legacy settings which _do_ matter to searchable snapshots, and which are still in use, so with this commit we move to a finer-grained model of repository operations within a searchable snapshot. Backport of #116918 to 8.16 * Add end-to-end test for reloading S3 credentials We don't seem to have a test that completely verifies that a S3 repository can reload credentials from an updated keystore. This commit adds such a test. Backport of #116762 to 8.16. |
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