Docs: Update Info on How to use FLUSHALL command with createCluster

[Ananth-2502]

We were tasked with building a high-performance, scalable system using Redis clusters. They decided to utilize the popular Node.js Redis client library, node-redis, as the foundation of their implementation.

As they delved into the project, they realized they needed a custom abstraction layer on top of node-redis to simplify certain operations. One such process was deleting all keys in the Redis cluster, akin to the flushAll method available for standalone Redis instances.

To their dismay, they discovered that the flushAll method was not directly available in the RedisClusterType of node-redis. Feeling perplexed, the team members scoured through the documentation, forums, and online resources, but there was no explicit mention of a built-in solution or workaround for this requirement.

Undeterred by this challenge, the team brainstormed possible alternatives. After careful consideration, they devised a creative approach to achieve the desired functionality. They decided to implement their own custom deleteAllKeys function by utilizing the power of Redis commands and the underlying Redis Cluster API.

The team's solution involved iterating over all the master nodes in the Redis cluster. They crafted a script that would connect to each master node individually, retrieve the keys present on that node using the SCAN command, and delete them using the DEL command.

By combining the SCAN and DEL commands across all master nodes, they effectively deleted all the keys in the Redis cluster, mimicking the behavior of the flushAll method. The custom deleteAllKeys function became a crucial part of their abstraction layer, providing a seamless and intuitive interface for their application developers to interact with Redis clusters.

In the end, the team's perseverance paid off, and they successfully implemented their own solution to tackle the absence of the flushAll method in the RedisClusterType of node-redis. They documented their approach, sharing it with the broader community and contributing to the collective knowledge surrounding Redis cluster management.

This story exemplifies the determination and resourcefulness of software developers when faced with challenges. It reminds us that, even in the absence of explicit documentation or ready-made solutions, creativity and collaboration can lead to innovative workarounds that address specific requirements and enhance the capabilities of existing libraries and frameworks.