diff --git a/elasticsearch-extensions/lib/elasticsearch/extensions/test/cluster.rb b/elasticsearch-extensions/lib/elasticsearch/extensions/test/cluster.rb
index <HASH>..<HASH> 100644
--- a/elasticsearch-extensions/lib/elasticsearch/extensions/test/cluster.rb
+++ b/elasticsearch-extensions/lib/elasticsearch/extensions/test/cluster.rb
@@ -30,7 +30,7 @@ module Elasticsearch
       # @see Cluster#stop Cluster.stop
       #
       module Cluster
-        @@number_of_nodes = 0
+        @@number_of_nodes = (ENV['TEST_CLUSTER_NODES'] || 2).to_i
 
         # Starts a cluster
         #
[EXT] Changed, that the default `@@number_of_nodes` for Test::Cluster matches the values from `start` method