RestoreService should update primary terms when restoring shards of existing indices #38197
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…xisting indices (elastic#38177) When restoring shards of existing indices, the RestoreService also restores the values of primary terms stored in the snapshot index metadata. The primary terms are not updated and could potentially conflict with current index primary terms if the restored primary terms are lower than the existing ones. This situation is likely to happen with replicated closed indices (because primary terms are increased when the index is transitioning from open to closed state, and the snapshotted primary terms are the one at the time the index was opened) (see elastic#38024) and maybe also with CCR. This commit changes the RestoreService so that it updates the primary terms using the maximum value between the snapshotted values and the existing values. Backport elastic/elasticsearch@da6269b Related to elastic#33888
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Backport of #38177 on 6.x.