I have about 7 million documents in my ES cluster using default
configurations (5 shards, 1 replica).
I set up 4 virtual machines with similar configurations on a 8 core server,
each virtual machine assigned with 2 virtual cores and 4 GB memory. On each
node I installed Elasticsearch.
I did several search tests to measure query response time and the results
are a bit confusing:
- When using only a single node, I get the best response time.
- When using a 2-node cluster response time increases significantly,
meaning the response time gets worse (the more found documents the worse
the response time)
- For a three- or four-node cluster the response time improves again and
is at the level of the single-node configuration.
Any idea why the 2-node cluster has such a bad performance compared to the
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