ElasticSearch 6.0 The insert into index blocks when querying

I am doing a POC on elastic search. I notice that when I issue a big aggregation query (or multiple small queries against the index). the latency on the logstash job which is doing inserts goes sky high.

I am using separate ingestion, data and query nodes.

It seems that elastic can either answer a query OR do a ingestion but not both at the same time.

How can I tune my cluster?

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