Thank you for the clarification! A few small questions, if I may -
- What is considered a "large cluster"? Do you have a thumb rule for this scenario? My cluster is currently indexing 5TB per day, would you consider that large?
- Would you recommend on ingest nodes that aren't doing any processing or filtering (in my case it is done prior to writing to Elasticsearch by various tools)? Is that any different from a coordinator node, given that ingest nodes are coordinators as well?
- Are there any cons to adding coordinator nodes in an early stage apart from the acknowledgement upon master elections (here - Master CPU high when bulk indexing in ES 5.1 - in willyaranda_vonage's comment) and some load on master nodes?