Feature Request

Is your feature request related to a problem? Please describe

The new major release would allow us to do some cleanup of deprecated logic.

High priority

Most of the options below could lead to serious issues and / or have caused confusion about how the driver should be used.
Here is a list of the candidates:

• follow up to cancelCommandsOnReconnectFailure should have appropriate warnings. #1787
  we should completely remove the cancelCommandsOnReconnectFailure option
• follow up to Deprecate lettuce DNS support classes  #1527
  we should completely remove the dnsResolver option
• follow up to Introduce DecodeBufferPolicy to reduce memory usage #1314
  we should completely remove the bufferUsageRatio
• follow up to Deprecate StatefulConnection.reset() #907
  we should remove the option to call RedisChannelWriter#reset()
• follow up to Deprecate AbstractRedisClient.setDefaultTimeout(…) to avoid ambiguity with RedisURI.getTimeout() #1868
  we should remove the get/set default timeout options in the AbstractRedisClient
• follow up to Deprecate connection-related methods on commands API #2028
  clean up the connection-related APIs, e.g. BaseRedisCommands

Lower priority

The options below are mostly tech-dept, that should not be considered critical.
The list below is order in a cherry-pick friendly order (higher up the list means a good candidate for quick change):

• follow up to Deprecate Utf8StringCodec in favor or StringCodec.UTF8 #1137
  we should remove the Utf8StringCodec class
• follow up to Migrate tests to JUnit 5 #430
  we should remove the wasRolledBack() in TransactionResult
• follow up to Adapt to changed terminology for master/replica #845
• follow up to Add support for SENTINEL REPLICAS command #2144
• follow up to Add support for REPLICAOF and CLUSTER REPLICAS commands #2020
  we should remove the references to master / slave
• follow up to Move SocketAddress resolution from RedisURI to SocketAddressResolver #1157 (and other related stories)
  we should remove all RedisURI methods that are deprecated
• follow up to Switch to Duration for timeouts #570
  we should remove all TimeUnit-based APIs, e.g. SocketOptions.connectTimeout, etc.
• follow up to Allow client to pick a specific TLS version and introduce PEM-based configuration #1167
  we should clean up the SslOptions interface
• follow up to Deprecate the STRALGO command and implement the LCS in its place #3037
  we should remove the STRALGO in favor of LCS
• follow up to Add FlushMode to FLUSHALL and FLUSHDB, and to SCRIPT FLUSH #1608
  we should remove deprecated methods related to flushing the database
• follow up to Provide a more conceise API for Sorted Set query operations using Range/Limit #363
  we should clean up the RedisSortedSetCommands API

Describe the solution you'd like

Remove:

• the options form the API
• any related logic in the application associated with them
• any integration or unit tests associated with them
• any documentation associated with them
• any templates that are used to generate command interfaces

Describe alternatives you've considered

N/A

Teachability, Documentation, Adoption, Migration Strategy

N/A