Bi-directional index following
In a bi-directional configuration, each cluster contains both leader and follower indices.
When upgrading clusters in this configuration, pause all index following and pause auto-follow patterns prior to upgrading both clusters.
After upgrading both clusters, resume index following and resume replication of auto-follow patterns.
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https://www.elastic.co/guide/en/elasticsearch/reference/8.17/ccr-bi-directional-upgrade.html
