Investigate RediSearch based indexing implementation

[vpavic]

RediSearch is a Redis module that, among other features, supports secondary indexing. We should investigate it as an option for implementing session indexing, as a more performant alternative to our RedisIndexedSessionRepository.

[gkorland]

@vpavic sounds like an interesting direction, what did you have in mind?

[vpavic]

Hi @gkorland!

Nothing too specific is planned just yet. RediSearch module was brought up by @rwinch in one of our Spring Session syncs as an option we are looking to explore as a potential means to implement a more efficient indexing of Redis-backed sessions (in contrast to the current implementation that's outlined in RedisIndexedSessionRepository javadoc).

We'll probably want to get acquainted with RediSearch before having any specific opinion or plan.

[marcusdacoregio]

Spring Data Redis' Redis Repositories supports secondary indexes https://docs.spring.io/spring-data/data-redis/docs/current/reference/html/#redis.repositories.indexes

[marcusdacoregio]

Redis is bringing the Redis Stack exclusive features into its open source release https://redis.com/blog/redis-adopts-dual-source-available-licensing/#:~:text=Future%20Redis%20source%2Davailable%20releases%20will%20unify%20core%20Redis%20with%20Redis%20Stack%2C%20including%20search%2C%20JSON%2C%20vector%2C%20probabilistic%2C%20and%20time%2Dseries%20data%20models%20in%20one%20free%2C%20easy%2Dto%2Duse%20package%20as%20downloadable%20software.