Splunk Enterprise Security setup: Why am I seeing error "unable to distribute to peer...because replication was unsuccessful."?

I've been trying to set up the Splunk Enterprise Security app, but I came across an issue that I can't find references to online. Unable to distribute to peer named indexer1_hostname at uri https://xx.xx.xx.xx:8089 because replication was unsuccessful. replicationStatus Failed failure info: failed_because_BUNDLE_SIZE_EXCEEDS_MAX_SIZE Please verify connectivity to the search peer, that the search peer is up, and an adequate level of system resources are available. See the Troubleshooting Manual for more information. Can someone already came across a similar issue? Thanks!