Coordinator node linked to Ingest node

I'm developing an elasticsearch cluster for a "search" use-case with small real-time ingestion of time series.
Here is my scheduled cluster:

  • 3 master-eligible nodes
  • 3 data nodes
  • 1 ingest node
  • 1 coordinator only node

What I would like to know is, how to connect CRUD request to my ES Cluster ? Does the coordinator only will be the only link to user ? For "create", the coordinator will drive my data directly to the ingest node before storage ?
Or should I make difference between writing operations and searching operations (respectively ingest and coordinator) ?


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