Slow elasticsearch results when data is big


We're considering moving our own lucene based distributed index and search
system to elasticsearch.

From tests I ran for 1 million indexed documents I get that elasticsearch
is running faster, but when running tests on 26 million I get that
elasticsearch is much slower.

I ran the 1 million and 25 million tests in the following search
configuration: 1 machine with 1 elasticsearch http node, 4 machines with 1
elasticsearch data node per machine (1 elasticsearch index with 2 shards
and 2 replicas).

Thanks, Ophir

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