Indexer Clustering - One Peer will be down for Server Battery Replacement

Hi Splunkers, One of our Splunk Clustered Indexer (Physical Server) will go thru to a battery replacement that might take around 1-2 hours. With this, we would like to seek your advice since this one Splunk Clustered Indexer (Physical Server) will be down for around 1-2 hours during the battery replacement. During the Splunk Clustered Indexer (Physical Server) battery replacement, do we need to initiate maintenance-mode or run splunk offline command? We would like to hear your feedback to avoid bucket related issues. Regards, Kevin