Fix corruption simulation in RecoveryFromGatewayIT#50921

DaveCTurner merged 2 commits intoelastic:feature/searchable-snapshotselastic/elasticsearch:feature/searchable-snapshotsfrom

DaveCTurner:2020-01-13-fix-RecoveryFromGatewayITDaveCTurner/elasticsearch:2020-01-13-fix-RecoveryFromGatewayITCopy head branch name to clipboard