Apply routing and response aggregation policies in OSS Cluster mode #3834
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Description of change
This PR introduces new routing and response aggregation policies for commands. Existing policies was mapped to new one to keep backward-compatibility. Keyless commands now will be randomly distributed across shards for better load balancing.
By default static policies applied for search commands and override one provided by COMMAND. Dynamic policy resolver implementation is added and might be applicable if COMMAND tips wants to be respected