Do not attempt any clustering maintenance operations, such as rolling restart, bundle pushes, or node additions, during upgrade.
All search heads and search head clusters must be running version 7.1.0 or higher.
For upgrade instructions, see Upgrade an indexer cluster.
The manager node and all peer nodes must be running version 7.1.0 or higher.
Rolling upgrade only applies to upgrades from version 7.1.x to a higher version of Splunk Enterprise.
Review the following requirements and considerations before you initiate a rolling upgrade: You can use rolling upgrade to minimize search disruption when upgrading peer nodes to a new version of Splunk Enterprise. Rolling upgrade lets you perform a phased upgrade of indexer peers with minimal interruption to your ongoing searches. Splunk Enterprise version 7.1.0 and higher supports rolling upgrade for indexer clusters. Perform a rolling upgrade of an indexer cluster
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