You choose. If you use solr cloud and have enabled ssl in your cluster, then all requests including replication will be secure (https). This it is still tcp but using TLS :)
Jan Høydahl > 6. nov. 2019 kl. 00:03 skrev Pushkar Raste <pushkar.ra...@gmail.com>: > > Hi, > When slaves/pull replicas copy index files from master is done using an > secure protocol or just over tcp? > -- > — Pushkar Raste