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System indices can be snapshotted and are therefore potential candidates to be mounted as searchable snapshot indices. As of today nothing prevents a snapshot to be mounted under an index name starting with . and this can lead to conflicting situations because searchable snapshot indices are read-only and Elasticsearch expects some system indices to be writable; because searchable snapshot indices will soon use an internal system index (#60522) to speed up recoveries and we should prevent the system index to be itself a searchable snapshot index (leading to some deadlock situation for recovery). This commit introduces a changes to prevent snapshots to be mounted as a system index.