Redis [BUG] FT.CREATE command does not work and hangs in a cluster (Redis 8)

Describe the bug

When using "redis-cli" or the Ruby "redis" + "redis-clustering" library, all attempts to use FT.CREATE fail. The command never responds (process has to be terminated) and does not create a new index.

To reproduce

Use the official Redis 8.0.1 Docker image to set up a cluster of 3 master nodes. Log into a shard and try to create any index with FT.CREATE.

Expected behavior

Should respond with "OK" and create the index.

Additional information

The search module is active, I checked.

Comment From: gottlike

Here a quick Ruby script for testing this with a similar config to mine.

#!/usr/bin/env ruby

require 'redis'
require 'redis-clustering'

redis = Redis::Cluster.new(
  nodes: ['rediss://:pass@1.example.com:6379', 'rediss://:pass@2.example.com:6379', 'rediss://:pass@3.example.com:6379']
)

begin
  # Test connection
  puts 'Testing Redis connection...'
  redis.ping
  puts '✓ Connected to Redis successfully'

  # Check if RediSearch is available
  puts 'Checking for RediSearch module...'
  modules = redis.call('MODULE', 'LIST')
  has_search = modules.any? { |mod| mod[1].include?('search') }

  if has_search
    puts '✓ RediSearch module found'
  else
    puts '✗ RediSearch module not found'
    exit 1
  end

  # Create the index
  puts 'Creating user index...'
  redis.call('FT.CREATE', 'user_idx', 'ON', 'HASH', 'PREFIX', '1', 'user/',
             'SCHEMA', 'something', 'TAG')

  puts "✓ Index 'user_idx' created successfully!"
rescue Redis::CommandError => e
  if e.message.include?('Index already exists')
    puts "ℹ Index 'user_idx' already exists"
  else
    puts "✗ Error: #{e.message}"
  end
rescue StandardError => e
  puts "✗ Error: #{e.message}"
end

Comment From: sundb

@gottlike please move this issue to https://github.com/RediSearch/RediSearch/issues, thx.