Make control-plane deployment optional

[cprass]

Hi, I'm using Quickwit in a distributed setup, using a S3 file-based metastore.

Server 1 has the following components:

• control plane
• indexer
• metastore

Server 2 is using the helm chart to add the searcher UI with those components:

• searchers
• metastore
• janitor

Since the values.yaml in cludes this part

control_plane:
  replicaCount: 1

I assumed if it is possible to disable the control-plane completely in such a distributed setup. The docs also say that the control-plane is only about indexing tasks. Now the replicaCount value doesn't seem to have any effect, it isn't used in the control-plane deployment file. It's using a hard-coded replicas: 1.

Would it make sense to have a deployment with only metastore, janitor and searchers and without control-plane? Would it even make sense to have multiple control planes or would a simple enable: true/false suffice?