c783488e97
This change adds a `_source` only snapshot repository that allows to wrap any existing repository as a _backend_ to snapshot only the `_source` part including live docs markers. Snapshots taken with the `source` repository won't include any indices, doc-values or points. The snapshot will be reduced in size and functionality such that it requires full re-indexing after it's successfully restored. The restore process will copy the `_source` data locally starts a special shard and engine to allow `match_all` scrolls and searches. Any other query, or get call will fail with and unsupported operation exception. The restored index is also marked as read-only. This feature aims mainly for disaster recovery use-cases where snapshot size is a concern or where time to restore is less of an issue. **NOTE**: The snapshot produced by this repository is still a valid lucene index. This change doesn't allow for any longer retention policies which is out of scope for this change. |
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