Imprecise param name on the rebalance API in HelixAdmin

[Lincong]

Describe the bug

A clear and concise description of what the bug is. The rebalance method on the HelixAdmin is:

  /**
   * Rebalance a resource in cluster
   * @param clusterName
   * @param resourceName
   * @param replica
   */
  void rebalance(String clusterName, String resourceName, int replica);

The last param is int replica. It'd be more precise to name it replicaNum or replicaCount since int replica is ambiguous since it could mean replica ID etc. In addition, please consider adding accurate description of params to its Java doc.

To Reproduce

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Expected behavior

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Additional context

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[narendly]

Thanks @Lincong - this is good feedback. Feel free to make a Pull Request yourself. Otherwise, we could also pick this up sometime.

[Lincong]

Thanks @narendly, which branch should I create a PR against?

[junkaixue]

@Lincong Master branch should be fine. But remember follow the OR template and steps.

[junkaixue]

Feel free to reopen it if you have a PR