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Doc cautions about index repo with Redis Cluster #2904

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3 changes: 3 additions & 0 deletions spring-session-docs/modules/ROOT/pages/configuration/redis.adoc
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Expand Up @@ -122,6 +122,9 @@ For example, it may create indexes based on session attributes like user ID or l
These indexes allow for efficient querying of sessions based on specific criteria, enhancing performance and enabling advanced session management features.
In addition to that, `RedisIndexedSessionRepository` also supports session expiration and deletion.

CAUTION: Using `RedisIndexedSessionRepository` with Redis Cluster is discouraged due to https://github.com/spring-projects/spring-data-redis/issues/1111[only being subscribed to events from one random redis node in the cluster],
causing a memory leak in the index and a slowdown in calls to `findByPrincipalName`. Using `RedisIndexedSessionRepository` in tandem with a redis that does not have multiple shards avoids this problem.

=== Configuring the `RedisSessionRepository`

==== Using Spring Boot Properties
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